release 5.0.9

addressing 5.0.7 regression (#230)

Addressing items described in #223

tagging 5.0.6; fixes #59

Merge pull request #57 from DiffSK/master

release 5.0.5

fixes #52 - tagged 5.0.4

issue #20 - needed to add _version to modules, and made __version__ a…

… simple import since we're not use a package

updating version numbers for 5.0.2 tag

fixes #22

corrected badge URL