issue #1650: Adding detailed doxgen comments for CCDictionary.
issue #1650: Made the destructor of CCDictElement as public method.
issue #1650: Inline function needs to be implemented in header file on Android platform.
Merge pull request #1846 from dumganhar/iss1650-doxgen-ccdictionary

issue #1650: Adding detailed doxgen comments for CCDictionary.