closed #2388: Creating a default texture for CCSprite if setTexture(nullptr) is invoked.
issue #2388: Checking whether the texture exists.
issue #2388: One more static_cast.
issue #2388: Updating comments for cc_2x2_white_image variable.
issue #2388: Fixing a bug in FadeIn::clone.
Merge pull request #3114 from dumganhar/iss2388-default-texture

closed #2388: Creating a default texture for CCSprite if setTexture(nullptr) is invoked.
Support Tizen 2.2 SDK.
- Update project files.
- based on develop branch.
- HelloCpp, SimpleGame, HelloLua, TestLua available to build.
Merge pull request #3123 from pyrasis/tizen_2.2

Support Tizen 2.2 SDK
Update .travis.yml
closed #2390, Resolve the bug plugin/tools/config.sh.
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into develop