2011-05-20: Version 1.2.0 
    This is the first version under GPL-v2 license.

2011-12-31: Version 1.2.1
    Fix default font object mem leak bug.

2012-12-31: Version 1.2.5
    Add context thread safe or shared support.

2013-02-12: Version 2.0.0
    Update code version 2.0.0 alpha.

2014-07-16: Version 2.0.1
    Fix font glyph advance_x bug.

2014-08-13:
    Fix crash bug for path clip.

2014-10-22:
    Fix gyp build on linux system.

2015-03-04: Version 2.1.5
    Porting to android system (version<=4.4).

2015-04-24: Version 2.1.8
    Optimization for android system.

2016-02-16: Version 2.2.0
    Update code version 2.2.0.
    Support image encode and decode api at external modules. 

2017-12-30: Version 2.3.0
    Update code version 2.3.0.
    Fix gif transparent frame bug.