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.
Typically we have made a separate Coming Soon heading, rather than putting this type of info under a product-specific heading. I think it makes sense to keep it separate, so there's less possibility for confusion with already-released features