Allow firmata access to all externally accessible board pins.

Remove ignore check from board pins 1, 11, 9 which prevented firmata and firmata users from accessing them.  The only important pins to cut off access to are the internal LIS3DH CS lines which aren't exposed on an external pad.

CircuitPlaygroundFirmata/CircuitPlaygroundFirmata.ino

@@ -1134,10 +1134,6 @@ void setup()
 
   // Tell Firmata to ignore pins that are used by the Circuit Playground hardware.
   // This MUST be called or else Firmata will 'clobber' pins like the SPI CS!
-  pinConfig[1]  = PIN_MODE_IGNORE;   // Pin 1 = LIS3DH interrupt
-  pinConfig[11] = PIN_MODE_IGNORE;   // Pin 11 = SPI
-  pinConfig[10] = PIN_MODE_IGNORE;   // Pin 10 = SPI
-  pinConfig[9]  = PIN_MODE_IGNORE;   // Pin 9  = SPI
   pinConfig[28] = PIN_MODE_IGNORE;   // Pin 28 = D8 = LIS3DH CS
   pinConfig[26] = PIN_MODE_IGNORE;   // Messes with CS too?