Don't access current project while plugin loads
Fix "Git Plus: Add (all)" without open editor

In the context, it would give a type error because
`atom.workspace.getActiveEditor()` was `undefined`.
Merge pull request #28 from Blaisorblade/topic/add-no-edit

Fix "Git Plus: Add (all)" without open editor
Merge pull request #27 from Blaisorblade/topic/fix-loading-type-error

Don't access current project while plugin loads
Prepare 2.4.1 release