Fixed bug with join on chromecast , fixes #55
Fixed issue where Chromecast device never drops from the picker on power off
Chromecast service will no longer be created from DeviceStore
Upgraded to latest commit (compiled from source) of the Java-WebSocket library by TooTallNate

Currently using library at commit 7c3b223536dc8bd4e8794ac265ad06679583e30f from master branch https://github.com/TooTallNate/Java-WebSocket
Fixed DLNA is unrealiable, fixes #56

Reusing same HttpClient object helps to increase the performance
Merge branch 'sdk_1.2-dev' into sdk_1.3-dev