Re-factored entire plugin
Re-factored entire plugin

* refactored and optimised the entire plugin
* changed license to Apache License v2.0

SergeyTsibulskiy/pongstgrm,zhaokunfay/pongstagr.am,pongstr/pongstagr.am,pongstr/pongstagr.am,pongstr/pongstgrm,pongstr/pongstgrm,zhaokunfay/pongstagr.am,SergeyTsibulskiy/pongstgrm