GPS driver (#55)

* u-blox GPS driver for both I2C and UART

gps/registers.go

@@ -0,0 +1,17 @@
+package gps
+
+// Constants/addresses used for u-blox I2C.
+
+// The I2C address which this device listens to.
+const (
+	I2C_ADDRESS = 0x42
+)
+
+const (
+	BYTES_AVAIL_REG = 0xfd
+	DATA_STREAM_REG = 0xff
+)
+
+const (
+	bufferSize = 32
+)