Refactored socketio code and created server/sockets/ to prepare backbone.iobind support.
Refactored code attaching express session middleware.
Fixed jshint errors.
Reverted imagemin dependency to previous version. v0.2.0 has some issues.
Added handlebars-runtime/ to .slugignore
Turned off RedisStore for Socket.io by default.
Updated express to 3.3.7
Merge with upstream.