Added MANIFEST.in file

This will include data files into final package
Added clean command to Makefile
Added javascript functions to deal with blocks (list, update)
Added ablock_lazy tag

This block will note be rendered at load time, but when client or
server side demand it

Closes #3
Added tests for lazy blocks
Improved test coverage
Use correct branch in travis badge
Use django nose test runner
Fixed request processing in python 3.X
Moved from iteritems to items

This makes the code Python 3 compatible
Decode http response in endpoint testing
Make coverage work for all environments
Merge branch 'master' into multiple_backends