Moving Cairo installation instructions out to root README to help future developers with setup, and added OSX step for making sure XCode Command-Line tools are current.
Merge branch 'staging' of https://github.com/code-dot-org/code-dot-org into staging
End of space at level names can cause collisions
Merge branch 'test' into staging
Fix prize anchor link
Merge pull request #809 from code-dot-org/fix_anchor_link

Fix prize anchor link
Fix share image cache lookup from redis
code.org translations 12/9
Merge branch 'staging' of github.com:code-dot-org/code-dot-org into staging
hourofcode.com translations 12/9
Automatically built.

commit 5d950b93cc477b0c781869f95b60b9fb2508c52d
Merge: 12a8f2c 215e0c8
Author: Tanya Parker <tanyacparker@gmail.com>
Date:   Tue Dec 9 20:22:48 2014 -0800

    Merge branch 'staging' of github.com:code-dot-org/code-dot-org into staging

commit 12a8f2c8de6dcb712e0509a9ec973a7fa2f972d0
Author: Tanya Parker <tanyacparker@gmail.com>
Date:   Tue Dec 9 20:22:42 2014 -0800

    code.org translations 12/9
update language files in hoc.com
update hoc.com ko, es, pt, bg
remove signup form from i18n hoc.com
Merge branch 'test' into staging
Merge pull request #810 from code-dot-org/test

DTP