Ship System.Json for 2.0 and 4.0 as well.

Ship System.Json for 2.0 and 4.0 as well.

Just because the .NET framework does not ship System.Json with their
core profiles does not mean we should not distribuet them.

Bring the joy of System.Json from Silverlight to the desktop

# with '#' will be ignored, and an empty message aborts the commit.
# On branch master
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#	modified:   ../Makefile
#	modified:   Makefile
#	modified:   System.Json.dll.sources
#
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
#
#	../../../eglib/src/gpath.c.orig
#	System.Json/.JsonValue.cs.swp
#	sources
#	../System/System.Net/#WebRequest.cs#
#	../../tools/monodoc/Resources/mono-ecma.css.orig
#	../../../mono.h
#	../../../mono/metadata/y
#	../../../mono/mini/.aot-compiler.c.swp
#	../../../mono/utils/mono-dtrace.h
#	../../../monotouch-enterprise.ashx
#	../../../web/