Revert "Update default.xml"

This reverts commit 5d94382e3548ebff79b800851b6a92600719636a.
Update upstream tags to android-4.3_r2.2

Change-Id: Iac15e61b4755e1319c8bdd61321dc68f85865d63
Add pigz repository

 * pigz is an optimized gzip which uses multiple cores
 * We're using pigz for compressed Nandroid support in recovery

Change-Id: I87c5d2f9b67e7104c75460279eb640fdfa99d9b7