Disable framing

Set the X-Frame-Options to DENY for added security.
Fixed case for header
Adding brackets.

Too much Coffeescript. Had some filters on. :)
interim commit
Merge branch 'master' into notif_pruning
interim commit, still nothing done
Update app.js

Only check if file exists when no other supported --arguments are given.
Display that 0.0.0.0 is Any Address.
Moved upgrade section to after install section.
added CLI --help!
closes #456, if the file path doesnt exists logger was crashing
closes #458
closes #463
hide the no topics warning when a new topic is posted on /unread
closes #457
fixes topics going into wrong category
Merge branch 'master' into notif_pruning
topics and posts counters will update for everyone
interim commit
upped mentions plugin minver
Merge branch 'master' of github.com:designcreateplay/NodeBB
Merge branch 'master' into notif_pruning
closes #462