Automatic reconnection

Connection can easily be dropped eg : enclose sensor tag with your hands. Add automatic reconnection with notification and written characteristics restoration. 

TO BE USED with noble pull https://github.com/sandeepmistry/noble/pull/67 #67
Connection drop/reconnection for now only implemented on linux

To test connection drop/reconnection run test.js and enclose sensor tag during different phases, you will see connection drop, reconnection messages.

Lahorde