made bower a dev dep. since we already require it globally
made bower a dev dep. since we already require it globally

alicoding/webmaker.org,cadecairos/webmaker.org,alicoding/webmaker.org,mmmavis/webmaker.org,mozilla/webmaker.org,mmmavis/webmaker.org,cadecairos/webmaker.org,mozilla/webmaker.org,jbuck/webmaker.org