Closes #1 : Added export calls where necessary.
redis backend implementation
#1 fix tempfile issue and some Python 3 stuff
rename import signature to avoid collision with redis library
Merge remote-tracking branch 'nandub/feature/redis-backend'
#6 New classes that will largely replace exising infrastructure
#6 Massive reorganization
#6 More thorough renovation
#6 Got all tests to run, though few pass
Sorted out all errors except for __contains__ stuff
 #6 Added __contains__ support to filter and sink interfaces

All tests pass at this point, but I'm gonna add some more tests
as well.
Close #6 : Crypto tests are in
Updated README to include Redis backend and warning about recent breaking changes
#7 Initial stuff to get tests to run
#7 Fixed some minor Python 3 incompatibilities
#7 Realized some files weren't yet added to the branch
#7 Working on compatibility
#7 Finally added MANIFEST to .gitignore
#7 fixed some temp location/anydbm instantiation issues.
#7 More unicode fixes.