Add local Gotham font for csedweek.org.
Convert fonts on csedweek.org to locally-hosted Gotham.
Properly handle strong and em with the new Gotham on csedweek.org.
Merge branch 'gotham' into staging
Fix 5px gap in modal function editor layout

Chrome calculates the #headers div as 45px when .blockly-header elements
have overflow:hidden.  Should only be 40px, so set the value explicitly.
fix test (forgot to check infile)
Merge branch 'staging' of github.com:code-dot-org/code-dot-org into staging
Merge pull request #512 from code-dot-org/staging

DTT