better and shorter pulse

after the feedback from @cmeerw I took an additional look at the CoSeMe library and I found the pong feature to keep the stream alive. I changed the pulse to send a pong. In addition I moved the pulse from the account into the CoSeMe connector. I think this is better now.
avoid multiple pulse intervals
Merge pull request #585 from TitanNano/dev

fix for #534
Merge pull request #586 from TitanNano/pulse

 better and shorter pulse
fix for #492