Allow devtools close via keyboard shortcut

[bbondy]

Fix #45

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).

Test Plan:

[bbondy]

Merging, let me know if there are follow up items.