Removed external folder
Adds external submodule
Updates travis-script, removed using download-deps.py now, 'external' is
a submodule module now. please use `git submodule update --init` to
fetch it.
Re-adds resources in cpp-tests and lua-tests, but removes some large
files. We need to reuse some resources when doing some tests.
Xcode project fix
Removes download-deps.py, using `git submodule update --init` to get the
external libraries. Thanks.
Merge pull request #6571 from dumganhar/re-add-res

'external' folder is a submodule now, re-added resources for cpp-tests and lua-tests except large files
[AUTO][ci skip]: updating cocos2dx_files.json
Merge pull request #6572 from CocosRobot/update_cocosfiles_1399268435

[AUTO][ci skip]: updating cocos2dx_files.json
Merge branch 'v3' of https://github.com/cocos2d/cocos2d-x into v3
Adds submodule for CocoStudio resources (70MB)
Updates xcode project, add ccs-res folder to Resources folder
Merge pull request #6573 from dumganhar/v3

Adds submodule for CocoStudio resources (70+MB)
Update README.md, update branch for travis build status
Merge branch 'v3' of https://github.com/cocos2d/cocos2d-x into v3
Particles can be created without texture

Needed for complex particles like in EarthWarrior3D
Merge pull request #6578 from ricardoquesada/particles_without_texture

Particles can be created without texture
Revert `new Sprite` change done a few days ago

Use `std::nothrow` for new in Sprite (should be done in all `new` code)
Merge pull request #6580 from ricardoquesada/sprite_new_fixes

Revert `new Sprite` change done a few days ago
[AUTO]: updating luabinding automatically