Merge branch 'release-1.7'
Update changelog
The product keys need to be declared in the <Key /> element, as per http://technet.microsoft.com/en-us/library/cc721925(v=ws.10).aspx
Update documentation to elaborate on Product Key specification
Add commented Key elements in answer files
Merge pull request #39 from chappoo/FixKeyElementsInUnattendedFiles

Updated Documentation For Product Keys
Merge branch 'master' into develop
Update Product Key Documentation, Move KMS Keys Into Key Element (Commented Out)
Add Additional Documentation For Key Element