Support multiple git projects in an editor window

[edrex]

With atom/tree-view#368 it's now possible to add multiple root folders to the tree view via the right click menu. Atomatigit is using the deprecated (atom/atom#3691) Project.getRepo method to find a repo to target, which returns the first repo found. Maybe instead it should look for a repo which is a direct ancestor of the currently active tab when the view is initialized/refreshed?

[fdobrovolny]

+1

Also this leads to unability to choose git submodule and work with it.