Wstool

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- Changed the way ``.bak`` files are created when overwriting existing configurations.
- Added the Scrape command.
- Added default git branch and status to ``wstool fetch --info``.
- Added versioned dependency on vcstools ``0.1.38`` to make use of new API features.

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- Fix regression which broke the -j option.
- Enable pretty printing of the ``.rosinstall`` file's YAML.

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- Fix for zsh completion.
- Fixed version dependency on vcstools for debian.

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- Fix for installation issue.

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- Added installation of generated man pages.
- Added installation of shell completion for wstool.
- Improved output of wstool info with the new get_current_version_label in vcstools.
- Added a foreach command.
- Added a ``--root`` option to wstool info.
- Enhanced the ``--update`` option for wstool set.
- Now uses multiple threads for network operations by default.
- Some other minor fixes and improvements and docs.

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- Releasing to allow changes for new platform vivid.
- Fix svn diff for change in output with svn 1.7.9.
- info command shows information about unmanaged paths.