Patch 1 :Added Arduino Due support

Patch 1 :Added Arduino Due support
Patch 2 :Modified code for review comments.
	 Added more informative info in README files for Arduino Due builds.
	 Fixed unit test makefiles to accomodate the 'sole' local.properties file.
Patch 3 :Fixed compilation errors in unused tests.(Those test
	 should be removed from the repo). This would make the Build Server
	 stop complaining.
Patch 4 (Joey): Rebased on master.

Change-Id: Ib4a0e838a5519712bf3b0138e01abf74893593fb