Removed Warnings : CS7093: Semicolon automatically inserted on unterminated line.

PlayScript requires semicolons after all statements.
Remove Warnings: CS0105: The using directive for 'xxx' appeared previously in this namespace

Remove dup'd import statements to clean up build
Xamarin Studio 4.0.12 Solution for building playscript-away3d-core

Created a solution for just building the playscript-away3d-core via repo

References:
+away3d-core-monomac (via playscript-mono)
+PlayScript.Dynaminc_aot-net_4_0 (via playscript-mono)
+pscorlib_aot-net_4_0_monomac
Ignore Xamarin userprefs file
Updated csproj to ref. ..\playscript-mono\mcs\class\...

Pull the proper projects/classes when using side-by-side repros as they
are layed out on Playscript.github.io