Raise the webextension poll period from 5 to 20 seconds (bug 31200).

A quick, temporary fix to get around Google safe browsing blockage of
bamsoftware.com

In Firefox, leaving out the STUN port caused connections to the STUN
server to fail

Some files were omitted in the .eslintignore, left as an exercise to the
reader.

We probably want to reduce amount of globals overall and use proper es
modules.

No idea why but, with it, when a client disconnects the datachannel
doesn't close.  This wasn't an issue prior to 359600dd since the
configuration wasn't being passed to the peerconnection constructor.

This probably just makes the url invalid and falls back to a default in
libwebrtc.

With,

  ./node_modules/.bin/coffee -b -c Cakefile `find . -path ./node_modules -prune -o -name '*.coffee'`