Enable user to select monitoring property from UI
Parse the monitoring enabled application.xml
remove .DS_Store
Merge branch 'develop' into basic_monitoring0.3
Create VM side message type and functions for transmission of minitoring message.
Let Master print out monitoring message after receive them.
implement the basic monitoring by sending selected sensor data to master.
1 Add mongoDB for storing monitoring data
2 Add Pressure sensor wuclass
Add pymongo installation hint in master_server.py
Merge remote-tracking branch 'origin/develop' into develop