HackerWins/summernote — pull request #600 by lqez (2014-09-12 09:47:20+00:00)
Title: Feature/history in a line

I reduced dual undo stack into one with stackOffset.
And changed recording undo stack timing from 'before modifying text' to 'after modifying text'. The first undo stack isrecorded while initiating summernote.