pulling in updateInProgress from RealMassive, this will ne distributed in a lot of places
@isClearing to false on onDestroy finished
specs working again
race condition and update throttling added to windows
race condifiton fixes added to polylines
deleting dead comments (@cthrax recommendation)
Merge pull request #918 from nmccready/issue_904_updateInPorgress

issue 904 race condition in plural directives