Bug 745283 - Part 1: Expose nsINetAddr for the local address of nsUDPSocket and support send with InputStream. r=jduell, r=mayhemer

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rename : netwerk/test/unit/test_bug952927.js => netwerk/test/unit/test_udpsocket.js
Bug 745283 - Part 2: Add udp-socket permission. r=sicking, r=baku
Bug 745283 - Part 3: Support send input stream and multicast operation via PUDPSocket.ipdl. r=jduell, r=mt
Bug 745283 - Part 4: WebIDL binding for UDPSocket API. r+sr=smaug, r=khuey, r=baku a=reland