Use addListenerEvent insted of on to catch mouse events

Works better with touch
Remove log
Clean old wordList before save
Limit max word length to 12 chars
Implement a basic startup animation

Proof of concept really, but useful to have the libraries
working together. This link [1] was useful to get how make them work
with requirejs.

[1] https://github.com/CreateJS/EaselJS/wiki/Using-easeljs-and-tweenjs-with-requirejs
Add sound to the startup animation
Don't allow ingress words with special chars, saces or numbers - OEP-825