Add release method

Change-Id: Iddb3829e65d66742e86f7533112ec3a897704c3b
SdpEndPoint: Fix exception in getLocalSessionDescriptor

Change-Id: I68d276f2b8f423d2304b82b9f49d5d9015f77c6d
template: Change audio and video order to keep chrome happy

Change-Id: I41fd8fcb5964f217433cdc15e267f63be308da53
Add keepAlive method

Change-Id: Iec2fd6ff8802c4b788541dc20e35463412ddbbc3