Merge pull request #66 from bassarisse/master

Added isRepeat property on keydown event
Added the 'main' attribute to package.json
Added support for CommonJS/browserify
fixed a small comment typo
Update readme.md
Update readme.md
Merge pull request #68 from AriaMinaei/master

Added support for CommonJS/browserify
Update keyboard.js

numdevide => numdivide
Merge pull request #70 from edi9999/patch-1

Update keyboard.js
Merge pull request #1 from RobertWHurst/master

Merge from main repo.