starting work on a eraser button
background is on a second canvas to not draw on it
fix background image
z-index changes after adding new bg canvas
you can't set a canvas anymore to define resize behavior
you do that through an option at instanciation
setImg: we make sure the globalCompositeOperation is good
so that the image is shown correctly
getImg: we used the passed canvas to return correct img
if we put every option in the default ones, we're gonna have trouble
refactoring webstorage stuff
adding methods to change "drawing mode"
adding a "drawingmode" control that lets user choose
between the pencil and the eraser
download button: we use an img instead of unicode
bc the unicode character is not supported on lots of devices
adding comments on reset stuff
changing default values
updating examples + readme + gruntfile
updated css
Merge branch 'feature/eraser'
bump to v0.2