Cabal init
Begin work on Document module
Tweak README
Add a simple test document
marshal documents from JSON
Add a stub test suite
Merge branch 'wip-document' of github.com:thsutton/retcon into wip-document
Test suite checks marshalling from JSON w/ 1 sample doc
diff type
Test for diffs (functor)
Merge branch 'wip-document'
Add config for Travis CI