Closed source version 1.5

v1.5
- Source code distribution moved from github to RFduino.com/download
  providing a single authoritative location for distribution.  This will
  also be the single authoritative source for change log information
  regarding the source code distribution.
- A single authoritative source for documentation is also being
  established
  on RFduino.com/documentation.
- Added support for Flash Memory.  See the RFduinoNonBLE
  flash example
  sketches for use.  More documentation is also
  available in
  cores/arduino/Memory.h
- Added a ProximityMovingAverage sketch for
  investigating RSSI to distance
  calculations
- Fix for iOS SDK 7.0 issue with the
  disconnect characteristic