fix the issure that an untextured sprite can not call setTexture.
Merge pull request #184 from nealzxc/master

fix the issure that an untextured sprite can not call setTexture.
Merge pull request #188 from LiuBoyu/develop

fixed Issue #187
Merge pull request #185 from dabing1022/ChildhoodAndyDev

Childhood andy dev
Merge pull request #47 from dualface/develop

Merge from dualface:develop