Added on demand loading for channel nicks.

This will help to handle channels (like Freenode) with huge nicks count ( > 1500). This will
also help save memory on the client side.

Also, we disabled publishing ServerNicks until and unless we find a better way
to do so.
On demand loading and pagination of channel nicks.
Added GAnalytics.
Enable google analytics for waartaa.
Disable polling for channel WHO data (for now).

Node is choking up to handle WHO responses for channels like Freenode
with a huge number of nicks. We'll try to figure out a better and
sane way to do this.