Wstool

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- Reverted the snapshot command since it was breaking ``rosws`` until it can be fixed.

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- Fixed some issues with new ``requirements.txt`` usage during the release process.

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- Fixed an issue with the conditional dependency on ``ordereddict`` in the ``setup.py`` file.

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- Fixed an issue which caused a traceback with invalid command line options.
- Added a feature to "snapshot" the current commit hashes in the workspace as a rosinstall file.
- Fixed option handling and documentation of the ``--untracked`` option.
- Added ``--shallow`` option to ``wstool init`` for shallow checkouts with git.
- Contributors: cbandera, rsinnet, amiller27, jayvdb, at-wat

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- Fix to avoid errors due to installing man pages with OS X's 10.11's new SIP settings.
- Added option to show a simplified version info table.
- Added the -m (timeout), -v (verbose), and -j (parallel jobs) options to each command.
- Contributors: NikolausDemmel, wkentaro

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- Fix command line arguments of ``wstool scrape``.