* Recognize (again) https+insecure scheme for symbolization POSTs.

This reverts the revert of #111 relaxing the test to make it pass as the
issue reported in #111 is caused by unrelated #120.

Added a test, verified the test failed before the fix.

This fixes #94.

* Fix the staticcheck failure.

* `git ls-files -- '*.go' | xargs gofmt -s -w`

* driver: unexport InternalOptions

This was an exported method that returned an internal type, so it's
unlikely that anyone depends on its presence.

* internal/binutils: remove newline in error string

golint reported: error strings should not be capitalized or end with
punctuation or a newline

* internal/driver: s/buildId/buildID/ per golint

* internal/elfexec: remove punctuation in error string

golint reported: error strings should not be capitalized or end with
punctuation or a newline

* internal/graph: correct comment

Found with golint.

* internal/graph: add method comment

golint reported: exported method Edge.WeightValue should have comment
or be unexported

* internal/report: remove newline in error string

golint reported: error strings should not be capitalized or end with
punctuation or a newline

* *: remove unused code

Found with honnef.co/go/tools/cmd/unused:

	internal/binutils/disasm_test.go:137:8: const objdump is unused (U1000)
	internal/driver/driver_test.go:353:6: type testProfile is unused (U1000)
	internal/graph/graph.go:838:6: func countEdges is unused (U1000)
	profile/proto.go:148:6: func encodeStringOpt is unused (U1000)

* *: simply code

Found with honnef.co/go/tools/cmd/gosimple:

	internal/driver/commands.go:471:24: should omit comparison to bool constant, can be simplified to !b (S1002)
	internal/driver/driver.go:163:5: should omit comparison to bool constant, can be simplified to !trim (S1002)
	internal/driver/driver.go:168:5: should omit comparison to bool constant, can be simplified to !focus (S1002)
	internal/driver/driver.go:172:5: should omit comparison to bool constant, can be simplified to !tagfocus (S1002)
	internal/driver/driver.go:176:5: should omit comparison to bool constant, can be simplified to !hide (S1002)
	internal/graph/dotgraph.go:213:34: should use make(map[string][]*Tag) instead (S1019)
	internal/report/report.go:1061:3: should replace loop with label = append(label, rpt.options.ProfileLabels...) (S1011)
	profile/proto.go:157:5: should omit comparison to bool constant, can be simplified to !x (S1002)

* *: correct mistakes

Found with honnef.co/go/tools/cmd/staticcheck:

	driver/driver.go:280:20: infinite recursive call (SA5007)
	internal/driver/driver_focus.go:54:11: this value of err is never used (SA4006)
	profile/proto.go:74:32: x | 0 always equals x (SA4016)

* Add linters to .travis.yml

Clarify that Go 1.7 or newer is required.

Go 1.6 currently fails the tests with build error

`profile/legacy_profile_test.go:309: t.Run undefined (type *testing.T has no field or method Run)`

Alternatively, we can fix it but I am not sure there is a strong reason
to support Go 1.6 or older.

Also add build status badge in the README.md file.

Use wildcard versions for Go in Travis config.

So that the latest patch version is tested.

A change to trigger a test Travis build

Enable continuous integration with Travis CI

Revert "Recognize https+insecure scheme for symbolization POSTs."

Recognize https+insecure scheme for symbolization POSTs.

Added a test, verified the test failed before the fix.

This fixes #94.

Remove filenames when showing function (default) granularity

Add .gitignore

Previously we were showing filenames together with function names
when generating reports at function granularity. This was an attempt
to provide more information to the user, but it clutters the output.
Also, in cases where a function is associated to multiple files
(eg template instantiations in C++), keeping the filename may prevent
us from combining nodes from the same function.

Will stop keeping filenames at the default function granularity, and will
remove the "functionnameonly" option which was previously providing this
functionality.

Common files to be ignored in source tree.

pprof: clean up temp files created during tests

Do not honor call_tree option when generating non-visual reports.

There is a check to only honor the call_tree option when generating non-visual
reports, but it wasn't being checked in all appropriate places, causing a
mismatch that triggered a panic.

Make [vsyscall] recognized as a not symbolizable mapping.

Do so by relaxing the matching to treat all mappings for file names
starting with a '[' as not symbolizable.

More govet fixes

Surprisingly these don't show up with go vet, but still cause issues
for the Go distribution.

internal/driver: use homeEnv function in tests

In changeset f90721db3d, fetch.go was changed to handle
the correct home directory environment variable on Plan 9
and Windows, but the tests were still using the $HOME
environment variable.

We change the tests to use the homeEnv function instead
of the $HOME environment variable.

Fixes #100.

gofmt recent changes

Fix issues reported by govet

Mainly use imported structs by field and update a mismatch printf
string on a test error message.

Search files under PPROF_BINARY_PATH using both its basename and its …

This allows pointing PPROF_BINARY_PATH to the root of the filesystem containing
the binaries of interest, similar to perf symfs.

This fixes #96

internal/driver: avoid using $HOME directly

Not all OSes have $HOME variable.
Use appropriate variables per OS.

Fixes https://github.com/golang/go/issues/18864

Skip TestSymbolizationPath (seems too Unix-specific).
Fix others with golden output to adjust for Windows file name syntax.

pprof/internal/symbolizer: do not recognize C:\foo\bar.exe as a URL

Fixes executables named on the command line on Windows.
Fixes the build failure on https://go-review.googlesource.com/#/c/36798 patch set 6.

The go runtime generates profiles in profile.proto format
without symbols or mappings. The expectation is that these
can be symbolized by passing the binary name to pprof.

The mechanism pprof uses relies to override the binary relies
on there being a mapping, and previously we moved the creation
of fake mappings to the legacy profile handlers, so profiles
parsed from profile.proto with no mappings can no longer be
symbolized.

Special case this situation to create a fake mapping and associate
all locations to it if there is a command line override but no
mappings.

Detect invalid addresses when parsing profile and report as error

For certain formats (eog, evince, gv, web, weblist), the visualizer
would be invoked regardless of whether the user specified a specific
output file to write to. In order to ensure that output is properly
written, the invokeVisualizer function has a check for whether the
output is os.Stdout and alters behavior based on that. This is the
wrong abstraction layer to do that work.

At the core of the problem is that PostProcess is used to both
do data post-processing that is inherent to the format, and also
to invoke some visualization for the data (to Stdout or browser).
We split these two steps apart and make it obvious which is which
by adding a visualizer field to Command.

This seperation of concerns allows us to simplify the code.

Merge commits from Go distribution

This corresponds to https://golang.org/cl/33157

Display HTTP errors from server

This corresponds to https://golang.org/cl/33454