Switch to new sourcemap syntax
Switch to new sourcemap syntax

The //@ syntax for source maps now causes IE10 to throw
an error. This branch switches to the new //# syntax which
works as expected across Chrome/FF/IE10.

R=matthew.scott
CC=
https://codereview.appspot.com/22450044

bac/juju-gui,mitechie/juju-gui,jrwren/juju-gui,jrwren/juju-gui,bac/juju-gui,jrwren/juju-gui,jrwren/juju-gui,mitechie/juju-gui,mitechie/juju-gui,bac/juju-gui,mitechie/juju-gui,bac/juju-gui