Merge pull request #55 from lite3/refactoring

add WorldClock::getInstance() and add dbccMacro.h to DBCCArmatureNode
Merge pull request #57 from lite3/refactoring

fix texture and support starling texture data
Merge pull request #58 from lite3/refactoring

add DBCCArmatureNode::createWithWorldClock
Merge pull request #60 from lite3/refactoring

add How to use dragonbones in lua