Remove SAMD boards

There is no XInput SAMD core (yet?), so these files aren't useful. This commit can be reverted if someone ever puts together the USB core.

Author: dmadison

README.md

@@ -18,15 +18,6 @@ This repository contains support for the following SparkFun Arduino-compatible d
 * [ATmega128RFA1 Development Board](https://www.sparkfun.com/products/11197)
 * [LilyPad USB Plus](https://www.sparkfun.com/products/14346)
 
-#### SAMD (ARM Cortex-M0+) Boards
-
-* [SparkFun SAMD21 Dev Breakout](https://www.sparkfun.com/products/13672)
-* [SparkFun SAMD21 Mini Breakout](https://www.sparkfun.com/products/13664)
-* [SparkFun 9DoF Razor IMU M0 (SAMD21)](https://www.sparkfun.com/products/14001)
-* [SparkFun LilyMini ProtoSnap (SAMD11)](https://www.sparkfun.com/products/14063)
-* [SparkFun LilyMini (SAMD11)](https://www.sparkfun.com/products/14064)
-* [SparkFun SAMD21 Pro RF LoRa 915MHz](https://www.sparkfun.com/products/14916)
-
 ### Notes
 
 * Some boards such as the Arduino Pro and Pro Mini come in more than one flavor.  For these **you must select the correct processor** in the 'Tools' menu.