Merge pull request #326 from codecombat/master

Merging master into production
Merge branch 'master' into production
Merge branch 'master' into production
Merge branch 'master' into production
Merge pull request #359 from codecombat/master

Merge master into production
Merge pull request #363 from codecombat/master

Merge master into production
Merge pull request #366 from codecombat/master

Merge master into production
Merge pull request #367 from codecombat/master

Manually specified tv4 version to fix npm checksum error
Merge branch 'master' into production
Merge branch 'master' into production
Merge branch 'master' into production
Merge branch 'master' into production
Merge pull request #386 from codecombat/master

Merge master into production
first step of translation

just trying the environment for translation
Update names.coffee
translate and refine Chinese simplified

translate:
send_password
create_account_title

refine:
slogan
no_mobile
play
translate and refine Chinese simplified

translate:
employers

refine:
coppa_why
Fixed the level session schema submitDate property.
Fixed the matches order on the ladder team page.
Added a log for figuring out what session is causing NaNs.