New Ice Servers configuration

Hi all,

we have included a new way to configure ICE servers for Licode clients. Now
you can set an array of servers (both STUN and TURN) in the configuration
parameter “erizoController.iceServers”. Details in our blog:

http://lynckia.com/licode/ice-servers.html

Please, take this into account if you pull the last master branch changes.

BR
Álvaro