Merge pull request #12 from cocos2d/develop

update coco2d-x
migrate saveToFile compatible with new renderer
RenderTexture saveToFile will return true
Merge branch 'develop' into develop_RenderTextureImprovement
merage cocos2d-x lua templateMerge branch 'develop' of https://github.com/cocos2d/cocos2d-x into develop
add runtime template
Merge pull request #5678 from samuele3hu/develop_new_fix

fix: The return value of `luaval_to_dictionary` was wrong and remove some warning
Merge pull request #5654 from dabingnn/develop_RenderTextureImprovement

Develop render texture improvement
Re-add hellocpp, hellolua
Removes unused configuration for Xcode.
Adds lua-hello samples, it works on iOS / Mac .
Removes xcscheme for test project.
Renames cocos2d_samples to cocos2d_tests, what could i say?
Renames 'samples' folder to 'tests', ouch....
cpp-hello -> cpp-empty-test, lua-hello -> lua-empty-test, ouch....
lua-empty-test folder structure refactoring.
plist rename.
lua-empty-test, cpp-empty-test work for iOS/Mac
cpp-empty-test works ok for Android.
Remove .gitkeep in 'cpp-empty-test', Add proguard-project.txt.