Rosinstall

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- stricter validation, no non-scm entries within scm entries
- minor issues around rosbash

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- bugfix tar not supported
- bugfix inofficial 'meta' attribute causes failure

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- new py-rosws CLI as reference implementation for REP110
- parallel operations diff, stat, install
- Generally stricter semantics and checking for validity of inputs
- No more recursing into other .rosinstall files
- roughly 100 more unit tests
- refactored single rosinstall script into several python module
- setup.sh parses .rosinstall to generate ROS_PACKAGE_PATH

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- small bugfix location-find with rospack
- small bugfix roszsh not found
- support top-level setup-file element for fuerte

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- removed dependency to datetime again