'setup_color' now contains logic to correctly detect:
  * cmd
  * cmd pipe
  * msys bash
  * msys pipe
  * cmd running inside msys bash (git-command)
  * cmd pipe running inside msys bash (git-command > outfile)

R=brucedawson@chromium.org, dnj@chromium.org
BUG=600049

Review URL: https://codereview.chromium.org/1851283002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@299682 0039d316-1c4b-4281-b951-d872f2087c98

  * `git bash` helper now will either:
    * launch an interactive bash prompt in the MinGW Terminal Emulator
    * launch a non-interactive bash shell if arguments are provided
  * `git bash` now includes python, python/Scripts and svn binaries in
    the PATH.
  * depot_tools' colorization now works in MinGW Terminal Emulator
  * batch scripts are now regenerated if any of them is missing.

R=agable@chromium.org, dnj@chromium.org, mmoss@chromium.org
BUG=598956

Review URL: https://codereview.chromium.org/1847783002 .

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@299616 0039d316-1c4b-4281-b951-d872f2087c98

This reverts commit eed06d62.

Accidental dcommit

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@299615 0039d316-1c4b-4281-b951-d872f2087c98

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@299614 0039d316-1c4b-4281-b951-d872f2087c98

This CL introduces new top level command for managing cached auth tokens:
  $ depot-tools-auth login codereview.chromium.org
  $ depot-tools-auth info codereview.chromium.org
  $ depot-tools-auth logout codereview.chromium.org

All scripts that use rietveld.Rietveld internally should be able to use cached
credentials created by 'depot-tools-auth' subcommand. Also 'depot-tools-auth'
is the only way to run login flow. If some scripts stumbles over expired or
revoked token, it dies with the error, asking user to run
'depot-tools-auth login <hostname>'.

Password login is still default. OAuth2 can be enabled by passing --oauth2 to
all scripts.

R=maruel@chromium.org
BUG=356813

Review URL: https://codereview.chromium.org/1074673002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@294764 0039d316-1c4b-4281-b951-d872f2087c98