Bumped version to 0.7.3 (#70)

0.7.2

0.7.0 changelog

0.6.1 in cabal

0.6.0.2

0.6.0.1 bugfix

0.6.0.0 changelog and .cabal version

Release 0.5.0.0

Release 0.4.0.1.

Update Changelog, Readme and examples.