Merge pull request #45 from lufylegend/develop

1.8.10 update
up
hitTest LMenubar
LSprite clone mouse_over mouse_out
mouseover mouseout
mobile dbclick,box2d gravity
gravity
dblclick
spritesheet
1.8.11 examples update
api update
1.8.11 update
Merge pull request #46 from lufylegend/lufylegend-1.8.11

Lufylegend 1.8.11