Added mouse module (love.mouse), updated doc/files.md

src/love.c

@@ -1,4 +1,4 @@
-/** 
+/**
  * Copyright (c) 2016 rxi
  *
  * This library is free software; you can redistribute it and/or modify it
@@ -23,6 +23,7 @@ int luaopen_system(lua_State *L);
 int luaopen_graphics(lua_State *L);
 int luaopen_timer(lua_State *L);
 int luaopen_keyboard(lua_State *L);
+int luaopen_mouse(lua_State *L);
 
 int luaopen_love(lua_State *L) {
   int i;
@@ -53,6 +54,7 @@ int luaopen_love(lua_State *L) {
     { "graphics", luaopen_graphics  },
     { "timer",    luaopen_timer     },
     { "keyboard", luaopen_keyboard  },
+    { "mouse",    luaopen_mouse     },
     { 0 },
   };
   for (i = 0; mods[i].name; i++) {