adding new button images that were missed in previous commit
fixing grid so buttons all line up nicely
Changing loading so login doesn't appear until after loading message disappears
Adding dynamic colored canvas background

* Adding canvas.js which is (modified) code from Midi.js library that adds a dynamic canvas based color gradient system that changes based on mouse movement
* Adding color background behind login div to make it more legible
* Changing navbar to match login window style
Merge pull request #32 from artfoundry/css

Css