display error notification when loading/refreshing build targets fails. fixes AtomBuild/atom-build-gulp#15
display error notification when loading/refreshing build targets fails. fixes AtomBuild/atom-build-gulp#15

AtomBuild/atom-build-gulp,noseglid/atom-build-gulp,noseglid/atom-build-gulp,AtomBuild/atom-build-gulp,AtomBuild/atom-build-gulp,noseglid/atom-build-gulp