Fix APTCA causes MethodAccessException in Windows Phone. Issue #64

AllowPartiallyTrustedCallersAttribute is not required in reality, and it causes assembly makes SecurityTransparent, so it causes MethodAccessException for non-core libraries in FCL like System.Collections.Concurrent or System.Numerics.

Author: yfakariya

src/MsgPack.WinRT.Portable/Properties/AssemblyInfo.cs

@@ -29,8 +29,6 @@
 
 [assembly: AssemblyFileVersion( "0.5.1857.601" )]
 
-[assembly: AllowPartiallyTrustedCallers]
-
 #if DEBUG || PERFORMANCE_TEST
 [assembly: InternalsVisibleTo( "MsgPack.UnitTest, PublicKey=0024000004800000940000000602000000240000525341310004000001000100a967de8de9d45380b93a6aa56f64fc2cb2d3c9d4b400e00de01f31ba9e15cf5ca95926dbf8760cce413eabd711e23df0c133193a570da8a3bb1bdc00ef170fccb2bc033266fa5346442c9cf0b071133d5b484845eab17095652aeafeeb71193506b8294d9c8c91e3fd01cc50bdbc2d0eb78dd655bb8cd0bd3cdbbcb192549cb4" )]
 [assembly: InternalsVisibleTo( "MsgPack.UnitTest.BclExtensions, PublicKey=0024000004800000940000000602000000240000525341310004000001000100a967de8de9d45380b93a6aa56f64fc2cb2d3c9d4b400e00de01f31ba9e15cf5ca95926dbf8760cce413eabd711e23df0c133193a570da8a3bb1bdc00ef170fccb2bc033266fa5346442c9cf0b071133d5b484845eab17095652aeafeeb71193506b8294d9c8c91e3fd01cc50bdbc2d0eb78dd655bb8cd0bd3cdbbcb192549cb4" )]