add button to send data over socket to server
add socket functionality: sends data over a given port (via socket.io) to a local server
refactor socket functionality
update TODO: delete magnetometer stuff, add parallelism
add some buttons in index.html
modify server functions for accepting data from master through a socket
Modifications to app.js:
	Comment out most of the functionality in app.getListings() (we're not worried about sending service/characteristic data to supermaster at this point)
	Add magnetometer data implementation
	Add startMeasurements() function: starts getting accelerometer and magnetometer data from devices and sending them to supermaster