Updated CHANGELOG.md with changes in Sprint 13.

https://github.com/ManageIQ/manageiq/issues?q=milestone%3A%22Sprint+13+Ending+Sept+29%2C+2014%22

@mfeifer @gmcculloug @dclarizio @chessbyte @roliveri @abellotti @kbrock Please review.
thanks - lookin' good :shipit: