Get nbdiff.js into a test harness.
Merge branch 'master' of github.com:tarmstrong/nbdiff
added buttons
Merge remote-tracking branch 'upstream/master' into undo_redo_buttons
Move test cases into jstests/test_nbdiff.js
Add easy test cases for NBDiffCell
Add jstests to jshint checks
Merge pull request #148 from tarmstrong/test-nbdiffjs

Refactor JS tests
Merge pull request #147 from bsplay/undo_redo_buttons

Undo redo buttons
Remove nbdiff-type from notebook metadata on merge save.

Fixes #144.
Merge pull request #149 from tarmstrong/remove-nbdiff-type

Remove nbdiff-type from notebook metadata on merge save.