Do not emit unforseen errors to user
Do not emit unforseen errors to user

If a child process has terminated or the kill signal was
not delivered properly for some reason, swallow the error
rather than throwing it in the users face.

Fixes #78

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