drag and drop
remove file
started command pattern for undo/redo and refactored the moveLeft/moveRight code
implemented undo
Merge branch 'master' into drag_drop_cells
removed comments
redo implemented
drag and drop with undo/redo
changed variable names
small fixes + changed comments
small fix
oops this time it's fixed
color/status of base now changes. Drag/drop should work fine now.
Merge pull request #131 from bsplay/drag_drop_cells

Drag drop cells
Fix minor javascript style issues, missing semi-colons.
Merge pull request #145 from tarmstrong/javascript-nitpicks

Fix minor javascript style issues, missing semi-colons.
More js style fixes, added jshintrc to control rules.
Add grunt to .travis.yml build
Get nbdiff.js into a test harness.
install node packages in travis build.