Added first implementation for managing websockets with python

generic superclass, enabling:
- subscribing to topics
- publishing on topics
- executing RPC with handling waiting for RPC-function to return
added validating against xml-definition
infrastrukture working
- parsing xml definition
- validating data against definition
- pub/sub
- rpc with callback
begin of implementing Camera-Socket
shutdown working even on pending rpcs
initial commit for AscTec UAV and Payload
Added serial classes for falcon
falcon and serial socket before connecting both
working websockets receiving and sending but blocking (more than one
socket per module)
successfully handling remote module RPC calls simultanious
Minor changes
Working dummy send and receive test-signals/topics
Merge branch 'Camera_Module' into Generic_PyWebsocket
Merge branch 'master' into Generic_PyWebsocket
web build
Merge branch 'master' of https://github.com/indus/uRC