Allow setImg() to resize image to canvas
Allow setImg() to resize image to canvas

Also fixed call to clearRect; it was clearing a rect width x width instead of width x height
zartata/drawingboard.js,Leimi/drawingboard.js,Leimi/drawingboard.js,zartata/drawingboard.js,Leimi/drawingboard.js,zartata/drawingboard.js