Adding functionality for async await

Added AsyncController to support item.SaveAsync() so that you can use
async await with your controller methods and have functionality to add
BusinessRule validation errors to your ModelState
Updating XML Comments to make more sense.
Merge pull request #253 from Bowman74/master

Corrected error of missing key file in CSLA Android assembly.
Merge pull request #254 from Bowman74/master

#251, Made changes to properly sign files using the project file instead...
#252 Update version numbers for release
#252 Update dependent assemblies.
Merge pull request #248 from jwendl/master

AsyncController for CSLA
Merge pull request #1 from MarimerLLC/master

Merge from Master