Rename SchtuffFragment to ViewMeasurementsFragment
Small formatting fix
Program to the interface, not the implementation
Finish renaming SchtuffFragment to ViewMeasurementsFragment
Program to the interface, not the implementation
Fix double parse exception

* Return Origin if the double string is empty
Remove unused constructor
When reading from nonexistent file, make a new one
Add toString() for Location
Add a nice timestamp method
Fix MAC address related crash
Implement ViewMeasurementsFragment functionality
Clean up WifiManager handle on pause
Extract MAC address handling code to utility fn
Give updateRssiTextView a more fitting name
Extract overview refresh code to util fn
Move measurements overview to SensorFragment

* This is convenient as there is no need to switch
  between fragments anymore
Show MAC addr of scanned AP, not own device's

* This makes more sense since the own MAC address
  is already shown anyway
Add scan counter TextView

* Allows for easily keeping track of the sample size for a given cell.
Add button to easily increment the X coordinate

* Useful when moving from one cell to the next when measuring RSSIs