small fix : IKeysMap data() function return a ref to the keys map

src/keybindings.h

@@ -42,7 +42,7 @@ public:
 	enum {PRESSED, RELEASED, HOLD};
 	IKeysMap();
     std::vector<Binding> getBindings(Action action) const;
-    std::vector<Binding> data(){return keys;}
+    std::vector<Binding>& data(){return keys;}
 protected:
 	std::vector<Binding> keys;
 };