removing some weird/unnecessary ".toString()" calls. Following change from @imrehorvath https://github.com/imrehorvath/morphic.js/commit/644150062f6a3805b50909c9f9a2adae65ac248a
adding credits in the readme.md file
minor spelling mistake and debug output correction
special keypad characters are now explicitly listed in class variables and referenced by meaningful name
including a piece of docs from Morphic.js that for some reason was left out