Changing getElementById to querySelector in an attempt to fix Travis build failures coming from path tests.
Changing getElementById to querySelector in an attempt to fix Travis build failures coming from path tests.

elbernante/progressbar.js,Hkmu/progressbar.js,Hkmu/progressbar.js,prepare/progressbar.js,kimmobrunfeldt/progressbar.js,kimmobrunfeldt/progressbar.js,renekaigen/progressbar.js,halilertekin/progressbar.js,halilertekin/progressbar.js,GerHobbelt/progressbar.js,imZack/progressbar.js,bukalov/progressbar.js,soulosoul/progressbar.js,bukalov/progressbar.js,renekaigen/progressbar.js,arielshad/progressbar.js,soulosoul/progressbar.js,arielshad/progressbar.js,kimmobrunfeldt/progressbar.js,GerHobbelt/progressbar.js,prepare/progressbar.js,marcomatteocci/progressbar.js,marcomatteocci/progressbar.js,imZack/progressbar.js,elbernante/progressbar.js