TheSpiderPig/Interview-Canvas-Problem — pull request #4 by TheSpiderPig (2014-09-30 19:50:38+00:00)
Title: added flow control to prevent the user from drawing before the canvas is created and added limiting to the number in the input boxes to match dimensions. 

Users cannot access the other functions until they create a canvas
first, nor can they use the spinner to enter elements outside of the range. They can, however, still enter invalid points (but we sill have
error handling in place to catch that.i)