update B2G on Linux to tip of b2g18_v1_0_0 branch; update Gaia to tip of v1-train branch; both tips as of 2013-02-06
update B2G on Windows to tip of b2g18_v1_0_0 branch as of 2013-02-06
update B2G on Mac to latest nightly build of b2g18_v1_0_0 branch as of 2013-02-06
Merge pull request #297 from mykmelez/update-b2g-gaia

update B2G/Gaia to 2013-02-06