Added the ability to assign a user an iOS UDID, and login with it.
Changed UDID to identifierForVendor
Fixed #1729.
Added endangered-burl and village-guard.
Paused branchingGroup A/B test and set everyone to no-practice. Realized that no-practice wasn't working at all, so fixed that.
Added Programmaticon II dependency.
Reduced how much we're sending to Mixpanel. Turned off experimental languages A/B test.
Turned off some completed A/B tests. Fixed an achievement recalculation typo Scott found.
Set up level achievements to be created manually by the client, hopefully making them a bit more stable.
Set up the WorldMap to load earned achievements and modify the User object to include absolutely everything.
Fixed Chinese Translation error

Signed-off-by: iAladdin <ialaddin@me.com>
Merge branch 'master' of github.com:codecombat/codecombat