Renames keyboard folder to keyboards, adds couple of tmk's fixes (#432)

* fixes from tmk's repo

* rename keyboard to keyboards

keyboards/retro_refit/retro_refit.c

@@ -0,0 +1,68 @@
+#include "retro_refit.h"
+
+__attribute__ ((weak))
+void matrix_init_user(void) {
+    // leave this function blank - it can be defined in a keymap file
+};
+
+__attribute__ ((weak))
+void matrix_scan_user(void) {
+    // leave this function blank - it can be defined in a keymap file
+};
+
+__attribute__ ((weak))
+void led_set_user(uint8_t usb_led) {
+    // leave this function blank - it can be defined in a keymap file
+};
+
+void matrix_init_kb(void) {
+    // put your keyboard start-up code here
+    // runs once when the firmware starts up
+
+    // Disable status LED on KB, enable status LED on Teensy (KB_STATUS = !TEENSY_STATUS)
+    DDRD |= (1<<6);
+    PORTD |= (1<<6);
+
+    matrix_init_user();
+};
+
+void amatrix_scan_kb(void) {
+    // put your looping keyboard code here
+    // runs every cycle (a lot)
+
+    matrix_scan_user();
+};
+
+void led_set_kb(uint8_t usb_led) {
+    // put your keyboard LED indicator (ex: Caps Lock LED) toggling code here
+
+    if (usb_led & (1<<USB_LED_CAPS_LOCK)) {
+        // output low
+        DDRD |= (1<<0);
+        PORTD &= ~(1<<0);
+    } else {
+        // Hi-Z
+        DDRD &= ~(1<<0);
+        PORTD &= ~(1<<0);
+    }
+    if (usb_led & (1<<USB_LED_NUM_LOCK)) {
+        // output low
+        DDRD |= (1<<1);
+        PORTD &= ~(1<<1);
+    } else {
+        // Hi-Z
+        DDRD &= ~(1<<1);
+        PORTD &= ~(1<<1);
+    }
+    if (usb_led & (1<<USB_LED_SCROLL_LOCK)) {
+        // output low
+        DDRC |= (1<<6);
+        PORTC &= ~(1<<6);
+    } else {
+        // Hi-Z
+        DDRC &= ~(1<<6);
+        PORTC &= ~(1<<6);
+    }
+
+    led_set_user(usb_led);
+};