Re-enabled KeyCDN for forums

Re-enabled my KeyCDN account on the forums just to play with CDN again

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Re-re-enabled KeyCDN account for the forums now that KeyCDN has HTTP/2 suppot

Since GTmetrix Chrome 36 doesn't support HTTP/2, using webpagetest.org Dulles vs San Francisco Cable 5Mbp tests to compare. Looking good

Forums hosted on 4GB Linode VPS Freemont, California so San Francisco test is naturally faster