Added support for JCheckBoxMenuItems

Refactored JCheckBoxWiringHarness to be AbstractButtonWiringHarness, since both JCheckBox and JCheckBoxMenuItem descend from AbstractButton.
Merge pull request #3 from GrandPoohBear/master

Including support for JCheckBoxMenuItems
Updates README.md.
Merge pull request #7 from DanLovesProofs/master

Updates README.md
Fixed broken image link
[ISSUE-4]: NPE on ComboBoxItemChanged
Merge pull request #8 from mglazer/master

Fixing an incredibly annoying NPE which pops in our logs all the time when using BoundSelection
Fixed wiki link that was not being relativized correctly.
Added in missing license file
Merge pull request #1 from palantir/master

updating local copy with master