Encoding UTF-8 on Tizen CCEditBox and check empty string.
Keep a previous text on Tizen CCEditBox.
Delete ByteBuffer pointer and NULL check.
Implement setIMEKeyboardState function for Tizen.
Modify space character check.
Merge branch 'tizen_2.1' of https://github.com/pyrasis/cocos2d-x
Merge pull request #2701 from dumganhar/master

Merge some changes of tizen from develop branch.