HackerWins/summernote — pull request #599 by lqez (2014-09-12 04:02:40+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.