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

* fixes from tmk's repo

* rename keyboard to keyboards

keyboards/sixkeyboard/sixkeyboard.c

@@ -0,0 +1,52 @@
+#include "sixkeyboard.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
+
+    DDRC |= (1<<4);
+    PORTC &= ~(1<<4);
+
+
+    DDRC |= (1<<6);
+    PORTC &= ~(1<<6);
+
+    DDRB |= (1<<6);
+    PORTB &= ~(1<<6);
+
+    DDRB |= (1<<4);
+    PORTB &= ~(1<<4);
+
+    DDRD |= (1<<5);
+    PORTD &= ~(1<<5);
+
+    DDRD |= (1<<2);
+    PORTD &= ~(1<<2);
+
+    DDRD |= (1<<3);
+    PORTD &= ~(1<<3);
+
+    matrix_init_user();
+};
+
+void matrix_scan_kb(void) {
+    // put your looping keyboard code here
+    // runs every cycle (a lot)
+
+    matrix_scan_user();
+};