Update script.js

function getParameterByName() duplicity...
Merge pull request #62 from netusco/patch-1

Update script.js removing duplicated function
Added support to threads; now sleep in sending threads is 10ms
Improved Erizo performance with Boost Condition Variables in WebRTCConnection.
Merged with changes in the repository
Fixed crash in WebRTCConnection destructor when destroying mutex
Minor changes in WebRTCConnection
Added constraints to set video size and default/max video bandwidth