Coveralls: Add back errors.js to sourcefiles (#1664)
Coveralls: Add back errors.js to sourcefiles (#1664)

Looks like I accidentally reverted my fix while rebasing
d6cd013429e056461c8766091f0a1cad3259dd7a
xzyfer/node-sass,xzyfer/node-sass,am11/node-sass,saper/node-sass,paulcbetts/node-sass,Smartbank/node-sass,sass/node-sass,xzyfer/node-sass,Smartbank/node-sass,saper/node-sass,sass/node-sass,paulcbetts/node-sass,Smartbank/node-sass,saper/node-sass,saper/node-sass,nschonni/node-sass,Smartbank/node-sass,nschonni/node-sass,xzyfer/node-sass,sass/node-sass,xzyfer/node-sass,xzyfer/node-sass,xzyfer/node-sass,saper/node-sass,sass/node-sass,am11/node-sass,nschonni/node-sass,sass/node-sass,paulcbetts/node-sass,paulcbetts/node-sass,Smartbank/node-sass,am11/node-sass,am11/node-sass,sass/node-sass,saper/node-sass,saper/node-sass,nschonni/node-sass,Smartbank/node-sass,nschonni/node-sass,Smartbank/node-sass,sass/node-sass,nschonni/node-sass,nschonni/node-sass