Merge pull request #1 from nusmodifications/master

Merge master from nusmods
Removed hardcoding of nusmods.com
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
added HTTP_HOST
Merge pull request #151 from Xinan/master

Actually `config.json.dist` is not meant to be used directly.  It goes like this: after cloning, make a copy of `config.json.dist`, rename to `config.json` and populate it with other details that is needed (FB app credentials for example). `config.json` is `gitignored` so any changes that you make to it won't be tracked.