Pathfinder

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* do not `chdir` in `walk_and_filter_generator`. `3 <https://github.com/jkeyes/pathfinder/pull/3>`_. (https://github.com/rubik)

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* Silly error in MANIFEST.in resolved.

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* Added README.rst to MANIFEST.in to prevent install error from pip.

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* new find_paths function returns a generator
* using any and all in OrFiter and AndFilter

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* Fixed install error in setup.py

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* File size filter
* Image filter
* Image dimensions filter
* Color image filter
* Greyscale image filter
* moved code to pathfinder package
* use nose for testing
* changed license from BSD to MIT
* override __or__ and __and__ for easy compound filter creation
* new Filter.find method
* ignore now works for filepaths