Issue 125 : add support  for gaia 1.1 and 1.2  branches

* 1.1 and 1.2 are now supported for search results
* gaia-l10n remains as-is
* tmx for gaia branches are downloadable
* repo select boxes have nicer labels now (Gaia 1.2 instead of gaia_1_2 label)
* links to hg support now gaia 1.x urls + unit tests updated