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

* fixes from tmk's repo

* rename keyboard to keyboards

keyboards/atreus/atreus.h

@@ -0,0 +1,28 @@
+#ifndef ATREUS_H
+#define ATREUS_H
+
+#include "matrix.h"
+#include "keymap.h"
+#include "backlight.h"
+#include <stddef.h>
+
+// This a shortcut to help you visually see your layout.
+// The first section contains all of the arguements
+// The second converts the arguments into a two-dimensional array
+#define KEYMAP( \
+  k00, k01, k02, k03, k04, k05, k06, k07, k08, k09, \
+  k10, k11, k12, k13, k14, k15, k16, k17, k18, k19, \
+  k20, k21, k22, k23, k24, k25, k26, k27, k28, k29, k2a, \
+  k30, k31, k32, k33, k34, k35, k36, k37, k38, k39, k3a \
+) \
+{ \
+	{ k00, k01, k02, k03, k04, KC_NO, k05, k06, k07, k08, k09 }, \
+	{ k10, k11, k12, k13, k14, KC_NO, k15, k16, k17, k18, k19 }, \
+	{ k20, k21, k22, k23, k24, k35,   k25, k26, k27, k28, k29 }, \
+	{ k2a, k30, k31, k32, k33, k34,   k36, k37, k38, k39, k3a } \
+}
+
+void matrix_init_user(void);
+void matrix_scan_user(void);
+
+#endif