Cache index.html for commonplace projects for a few minutes (bug 1071468)

Those pages are served by us, not the CDN, so we can afford to cache
them for a few minutes to help repeat views. If a client wants to bypass
the cache (for instance when we push to production) they can hit reload,
their browser will send a If-Modified-Since or If-None-Match and we'll
give them the new content.
Script conversion from Serbian Cyrillic to Latin (20141027)
Merge pull request #2679 from diox/cache-commonplace-views

Cache index.html for commonplace projects for a few minutes (bug 1071468)
Consider an app complete with either support email or URL (bug 1076243)
Merge pull request #2684 from diox/suppory-email-or-url-hotfix

Consider an app complete with either support email or URL (bug 1076243)
Merge pull request #2683 from flodolo/20141027

Update sr-Latn using sr (Cyrillic) content converted with icu4c