BUG: fixed Lua50 to be Lua51 in FIND_PACKAGE_HANDLE_STANDARD_ARGS call.

Modules/FindLua51.cmake

@@ -68,7 +68,7 @@ ENDIF(LUA_LIBRARY)
 INCLUDE(FindPackageHandleStandardArgs)
 # handle the QUIETLY and REQUIRED arguments and set LUA_FOUND to TRUE if 
 # all listed variables are TRUE
-FIND_PACKAGE_HANDLE_STANDARD_ARGS(Lua50  DEFAULT_MSG  LUA_LIBRARIES LUA_INCLUDE_DIR)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(Lua51  DEFAULT_MSG  LUA_LIBRARIES LUA_INCLUDE_DIR)
 
 MARK_AS_ADVANCED(LUA_INCLUDE_DIR LUA_LIBRARIES LUA_LIBRARY LUA_MATH_LIBRARY)