Add HHVM BetaFeature and wgPoweredByHHVM variable

To be deployed Saturday
enable BetaFeatures on meta and testwiki when HHVM goes live
HHVM FastCGI via port instead of a socket for beta features
disable refreshspecialpages when HHVM goes live
rebase master
database servers defined in LS
Merge pull request #389 from Orain/hhvm-beta

HHVM Beta Feature
Add three extensions
full url link
fix syntax errors
HHVM BetaFeature on all wikis
add prod8 and HHVM monitoring
use .png for the ubuntu logo;
add prod6 to http-servers
disable ssl check
Merge pull request #390 from Southparkfan/patch-32

Add three extensions
always run cli scripts using zend not HHVM
rebase
Add a HHVM tag to RC for analysis of usage