AirSpy Firmware first public version v1.0.0-rc3

Modifications since v0.9.9 Beta, rc1 & rc2:

• Support of M0s (in libopencm3 & airspy) (for future custom firmware 3rd party ... M0s is fully available)
• Code cleanup (removing unused functions ...)
• Center the tracking filter on the RX frequency rather than the LO
• Fix freeze on start/stop with some boards
• MD5 for https://github.com/airspy/firmware/releases/tag/v1.0.0-rc3 (build on 2015-01-09):
  md5sum airspy_fw/airspy_rom_to_ram/airspy_rom_to_ram.bin
b90fc2b73d84b67e12a4d6ec4ad5bb5d airspy_fw/airspy_rom_to_ram/airspy_rom_to_ram.bin
airspy_fw/airspy_rom_to_ram/airspy_rom_to_ram.bin Size 17 808 bytes
  Note:
  Becareful if you build it yourself the date of the day is included in airspy_rom_to_ram.bin,
  so if you want to have same MD5 you need to change your PC date to 2015-01-09 just before to build it.

* To flash the latest firmware in attachment `airspy_fw_v1.0.0-rc3.zip`
* For Windows:
  * 1. Extract the archive
  * 2. Connect AirSpy with USB to your computer
  * 3. Launch `airspy_spiflash.bat` from extracted archive directory
  * 4. Disconnect AirSpy from USB computer
  * 5. Connect AirSpy with USB to your computer, now you can use your favorite software