Test out PHP instead of HHVM
Revert "Test out PHP instead of HHVM"

This reverts commit 65c2072407a81e242e105521e46936066229a470.
Revert "Revert "Test out PHP instead of HHVM""

This reverts commit d3eaefe39e1fad66b8dda33f054638563a6ec06b.
HHVM again
HHVM take 2
Add rollbar error reporting
Update HHVM to use 3.x
Pass forwarded port to FastCGI

Set `SERVER_PORT` to the forwarded port (from the client) as sent by the
Heroku Router. This resolves #8
Merge branch 'master' into prod

Conflicts:
	composer.lock
Update plugins, remove markdown-on-save-improved