Merge pull request #21 from lite3/myrefactoring

add demo project and add api for DBCCFactory
Merge pull request #22 from lite3/myrefactoring

add DBCCArmatureNode and replace DBCCFactory::hasSkeleton to hasDragonBones
Merge pull request #23 from lite3/myrefactoring

fix some bugs
Merge pull request #24 from lite3/myrefactoring

fix: repeat play current animation
add helloWorldScene
add proj.win32 for libdragonbones
Merge branch 'refactoring' into myrefactoring