Updated documentation to include submodules and changed README to markdown.
Output more bucket metadata on ls -Lb
Fixed problem where gsutil -m is hard to interrupt (only for Linux/MacOS; problem still exists for Windows)
Renamed gsutil meta_generation params to metageneration, for consistency with GCS docs
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Fixed broken reference to boto_lib_dir in update command.
Add a test for the update command.
Fixed bug where gsutil cp -D didn't preserve metadata
Changed gsutil to check for available updates periodically
Update gsutil help docstrings for RST generation compatibility.
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Added note to gsutil update help that automatic software update checks aren't performed when stdin/out/err aren't connected to a TTY
Add support for external service accounts.
Added support for specifying byte range to cat command; change creds help summary to use Title Case; fixed ISO 639.1 ref in config command
Added support for specifying byte range to cat command; change creds help summary to use Title Case; fixed ISO 639.1 ref in config command
Updated perfdiag command to track availability and record TCP settings.
Fixed flaky gsutil rm test
Plumbed https_validate_certificates through to OAuth2 plugin handler
Adds metadata parameter to perfdiag command.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	gslib/util.py