Tvrenamr

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- Improve the code that checks if tvr has everything needed to rename a file

- Handle seasons & episodes as numbers internally

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- Fix renaming shows with 720[p] in the filename

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- Fix partial regex support

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- Fix python 3 support in the tests

- Show IDs are now cached, cutting web requests by 50% for the majority of renames

- Tentative multiple episode file support. Hope to improve this over time

- Fix custom output format so it can use custom regex syntax

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- Add python 3 support!

- Fix python 2.6 support

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- Return destination filepath from a rename (useful for libs)