fallback python-based .rtf extraction

[deanmalmgren]

This is currently using the unrtf command line tool, but it would be nice to have a pure python extraction method as a fallback.

[pombredanne]

@deanmalmgren Have a look at https://github.com/brendonh/pyth

[deanmalmgren]

Nice find, @pombredanne; thanks for pointing this out!

If anyone is interested in taking a crack at this, the pdf parser has a pretty good example for how to have multiple methods for extracting text from documents.

[jpadilla]

@deanmalmgren I'll try to get this done in a few.

[deanmalmgren]

Awesome, thanks @jpadilla!

[jpadilla]

For one thing, pyth seems to have issues with charsets on the existing RTF files in textract which will make it harder to test. Might be related to brendonh/pyth#30

[pombredanne]

@jpadilla indeed, and I ran pyth through the test files from unrtf and submitted a ticket there: brendonh/pyth#34
Which is an opportunity to help make @brendonh pyth better?