First draft RelNotes for Nov 5, 2014 release

@mhoeber @srpearce @lamagnifica @explorerleslie @shnayder 
Here's a first draft of release notes -- please review. 
A known issue is that the link to the Developer's Guide is broken.
@mhoeber @lamagnifica I placed the "Coming Soon" section after all the software sections and before "Documentation". Let me know if it should be placed in a different position.