Workaround for some problems due to UITextField of CCEditBoxImplIOS is attached as a view above OpenGL view. It has a topmost touch priority higher than any other CCNode objects, and also cannot be veiled by any other CCNode objects.
In this change, UITextField is visible only when the CCEditBox is in edit mode. And in non-edit mode, UITextField is hidden and CCLabelTTF is shown instead with all same attributes at the same place.
Comment out 'setVisible()'
Merge branch 'master' of https://github.com/neokim/cocos2d-x into ios-editbox
fixed #1825:  The default color of text on CCEditBox is WHITE now. Fixed issues for CCEditBox of  MAC port.
fixed #1825: Fixing compilation errors for CCEditBox of win32 port.
Merge pull request #2161 from dumganhar/iss1825-ios-editbox

fixed #1825: Using CCLabelTTF to show text for CCEditBox of iOS port.