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

* fixes from tmk's repo

* rename keyboard to keyboards

keyboards/sixkeyboard/sixkeyboard.h

@@ -0,0 +1,22 @@
+#ifndef SIXKEYBOARD_H
+#define SIXKEYBOARD_H
+
+#include "quantum.h"
+
+// This macro is an example of using a non-standard row-column matrix. The 
+// keyboard in question had 11 rows and 8 columns, but the rows were not all 
+// horizontal, and the columns were not all vertical. For example, row 2 
+// contained "Print Screen", "N", "M", ",", ".", "/", "Right Shift", and
+// "Left Alt". Column 0 contained "F6", "7", "O", "'", "Q", "D", "B", 
+// "Left Alt", "Up Arrow", and "Down Arrow".
+//
+// The macro makes programming the keys easier and in a more straight-forward
+// manner because it realigns the keys into a 6x15 sensible keyboard layout 
+// instead of the obtuse 11x8 matrix.
+
+
+void matrix_init_user(void);
+void matrix_scan_user(void);
+void led_set_user(uint8_t usb_led);
+
+#endif