add gbox_v2.1_defconfig
add gbox_v2.3_defconfig
gbox configs: change kernel repo to MakaLabs/staging
gbox config: update v2.1/2.2 config file name
xbmcpvr: change to master branch
xbmcpvr: update libhts patch
xbmc: add libxslt
xbmc: change to Gotham branch
confluence_powerbutton.patch: update for gotham
xbmcpvr bump