- added hex file which can be opened by the teensy loader directly - no need to download libraries and arduino
- added initial (beta) functionality for analog_read, analog_write, digital_read, and digital_write.
- added hard-coded firmware firsion (located at top of file) - so now you only enter device_id and manufacture_date with 1013+.
- fixed memory leak (added additional free(json) and free(data_raw_average) at end of void loop() )
- NOTE - maximum # of saved (measuring light != 0) data points is 8000 - 10000 depending on the size of the protocol JSON (larger protocol JSON means less memory to save data).

Signed-off-by:  <Greg>