fixing unit tests for localized runs. CR: LukeW, BriceLam
Add Clean to the list of default targets
Mapping API: type mappings
Unicornopoly: The PropertyInfo Trading Game (1667: Replace uses of Type.GetProperty, etc.)

The traditional methods for getting PropertyInfos from a Type are not available in .NET for Windows Store apps. The new extension methods should be used instead on .NET 4.5 and later. Where the new APIs are reasonable we start using and add support in the .NET 4 build. Where the new APIs are too cumbersome there are new extension methods tailored to the common things that we do.
Underscoring divergence from the vision (Fix for 1654: Support for identifiers starting with underscore)

Allow EDM identifiers to start with an underscore.

Also included here are the "Assertiveness Training" changes that allow unit tests to pass with debug build. These have already been applied to master.
Merge branch 'hotfix-6.0.1'
fixing remaining test failures when running on Sql Azure. CR: LukeW