Fix ArgumentOutOfRangeException occurs when serializing members count is greater than 127. Issue #63.

This commit fixes wrong condition whether using ldc.i4.s or ldc.i4. IL specifies that an operand of x.s is i1(SIGNED 1 byte integer).
This commit also includes unit testing cases.

Author: yfakariya

CHANGES.txt

@@ -219,3 +219,4 @@ Relase 0.5.9 - 2015/2/01
   BUG FIXES
   * Fix NullReferenceException is thrown for annotated non-public members serialization/deserialization in WinRT.
   * Fix collection typed property which has non-public setter are not handled correctly. Issue #62.
+  * Fix ArgumentOutOfRangeException occurs when serializing members count is greater than 127. Issue #63.

src/MsgPack/Serialization/EmittingSerializers/ILEmittingSerializerBuilder`2.cs

@@ -172,7 +172,7 @@ protected override ILConstruct MakeInt32Literal( TContext context, int constant
 				}
 				default:
 				{
-					if ( 0 <= constant && constant <= 255 )
+					if ( SByte.MinValue <= constant && constant <= SByte.MaxValue )
 					{
 						return ILConstruct.Literal( typeof( int ), constant, il => il.EmitLdc_I4_S( unchecked( ( byte )constant ) ) );
 					}