Added a new API method getPadID for reversing the Readonly ID and introduced the API level 1.4.1. Based on: https://github.com/disy-mk/etherpad-lite/commit/97402f60b89549b32238505397c781dce8d79a4c
Implemented the the new API method getPadID for reversing the Readonly ID. Based on: https://github.com/disy-mk/etherpad-lite/commit/ff88c19fc12887a49fdb752adb15ee3145f521f0