Post SIPEngineGotException also if Engine fails to start

Ignore-this: 26cc9f5073e132ff7d4cbeddc1583174

darcs-hash:20131125111442-56b4d-f4c979bc36cd13f0bb547c7187f8c2a4325c63ab
Make send_composing_indication refresh argument optional

Ignore-this: fb2a7b9d07939bb337298d4adcdfa4ed

darcs-hash:20131127094230-56b4d-fcc72a3b909bcf90c4421212006a36aec7bc9e64
Return default refresh value in ChatStreamGotComposingIndication if not specified

Ignore-this: 371beb211ea5bfce592ba607768b0616

darcs-hash:20131127094601-56b4d-05ef37211801a00e1ed4e5d25818354fda2a8a5f