Feature: draw lines between portal and resonators

Bug: ```L.multiPolyline``` didn't fire ```add``` and ```remove``` event function, so can't add reference to ```window.resonatorsLines``` and can't remove the lines when portal fire ```remove``` event.
![resonators lines](https://f.cloud.github.com/assets/2596446/153184/cfd0fbe2-75ef-11e2-82ec-008f7ab6dd2a.jpg)