Code review comment for lp:~samertm/ubuntu-calculator-app/fixes-1273887

This was how the app acted when I changed the line to:
screenFormula = [{_text:'', _operation: '', _number:'0'}];

http://www.youtube.com/watch?v=c5nULrERgGk&feature=youtu.be

For the first 5 seconds, I hit the operators before hitting clear. I hit clear 6 seconds in, and you can see the calculator screen move downwards. It also tacks '0' onto the number if you start typing.