Promises: Update browser support

Update any mentions of browser support throughout the article. Chromium 32 (i.e. Chrome 32 and Opera 19) supports promises by default.

This patch includes various other tweaks and minor improvements.
Merge pull request #921 from mathiasbynens/promises-tweaks

Promises: Update browser support
Couple of markup fixes
Merge pull request #923 from jakearchibald/master

Couple of markup fixes
Automatically updating the calendar
another update on quota research
new tab for some links in quota research article
Merge pull request #924 from agektmr/quota_article

Final fix for quota research article
Merge pull request #925 from html5rocks/master

Merging updates to live