adds support for GH60 Satan keyboard (#407)

* adds support for GH60 Satan keyboard

ANSI 125 layout, capslock and backlight implemented, support for
WS2812LED strip included

* added Phantom and GH60 Satan to travis

keyboard/satan/backlight.c

@@ -0,0 +1,24 @@
+
+#include <avr/io.h>
+#include "backlight.h"
+#include "print.h"
+
+void init_backlight_pin(void) {
+    print("init_backlight_pin()\n");
+    // Set our LED pins as output
+    DDRB |= (1<<6);
+
+    // Set our LED pins low
+    PORTB &= ~(1<<6);
+}
+
+void backlight_set(uint8_t level) {
+    if ( level == 0 ) {
+        // Turn off light
+        PORTB |= (1<<6);
+    } else {
+        // Turn on light
+        PORTB &= ~(1<<6);
+    }
+}
+