wrote dummy client to share messages with GUI - works
Added new Icons for evaluation controls :
- Undo
- Step Into
- Step Over
- Complete
- Finish
- Stop
- Debug

Change icon for drawing edge

Started a communication service :
- Launching Server socket, and waiting for a connection
- Wrote a dummy client socket that connect and exchange message with server.
Merge branch 'master' of https://github.com/ggrov/tinker