Rename Experimental into FlamingParrot

+ makes flaming parrot theme default

Change-Id: I68312a9aed64f850ff50292058943404462f965e
Merge commit 'refs/changes/63/2363/5' of http://gerrit.tuleap.net/tuleap into HEAD

* http://gerrit.tuleap.net/tuleap:
  Rename Experimental into FlamingParrot
This is Tuleap 6.12.99.102

Change-Id: I4fd5a9bba416ced9b8ea02a194b5005e93f50ba0