Specs: Only setup gulp/grunt when required
Specs: Only setup gulp/grunt when required

It takes quite a while to copy all those dependencies,
only do it when necessary.

This halved the time it took for the specs to run on my
computer!

bwinton/atom-build,MadcapJake/atom-build,sphaerophoria/atom-build,jhasse/atom-build,MackieLoeffel/atom-build,forivall/atom-build,gogoprog/atom-build,noseglid/atom-build,gregerolsson/atom-build,oli-obk/atom-build,5n8ke/atom-build