Added UnformattedTextFileDescriptionTemplate so F# files are not forced to be formatted during creation

Updated CustomKeyboardExtension to use the new
UnformattedTextFileDescriptionTemplate to avoid formatting.
Merge pull request #724 from 7sharp9/unformattedTemplates

Added UnformattedTextFileDescriptionTemplate so F# files are not forced ...
Fixed project template type for iPhone Empty, added default resource for iPad