Merge pull request #32 from lite3/refactoring

fix boundingbox and enabled CascadeOpacity and CascadeColor by default
Merge pull request #33 from lite3/refactoring

fix flash when begin
fix parse area data bug
Merge branch 'refactoring' of https://github.com/DragonBones/DragonBonesCPP into refactoring
update README for engines
update README
update README.md
delete engines directory, the engine source code will put in demo directory; add ios_mac project to cocos2d-x-3.x demo.
update win32 demo project of cocos2d-x-3.x
update project of win32
update project for win32
Merge pull request #34 from zrong/refactoring

update demo project
add some samples to demo, there are some error in demo, please do not compile it.
Merge branch 'refactoring' of github.com:zrong/DragonBonesCPP into refactoring
update win32 project
move demo files into examples
refactory demo for cocos2d-x 3.2
fix demo's title
rename DemoBase to Demo
fix typo