Don't fail create-installer if ATOM_ACCESS_TOKEN isn't set

This lets users create one-off installers locally without having to download
every other release to create deltas.
Upgrade to tree-view@0.131
Upgrade to incompatible-packages@0.10
:arrow_up: Upgrade to grammar-selector@0.35
Twerk error message
Merge pull request #3836 from atom/dont-fail-if-no-deltas

Don't fail create-installer if ATOM_ACCESS_TOKEN isn't set
Upgrade to settings-view@0.152