Added Twitter Chat Sessions

Import Jobs are:
- rake chatsessions:add (weekly or daily)
- rake questions:import (ev. 15 minutes)
- rake answers:import (ev. 15 minutes)

Path:
/chatsessions/:id

Actual there is still a problem with li:before styling
I don't see where this method actually gets called? Also, for this type of method (specific for ChatSessions), it should be in the ChatSessions controller. Unless there's another reason for it to be in ApplicationController that I'm not seeing?