don’t return an array!
Fix hanging with many tabs of the same name.

There was some gnarly recursion. This prevents recursing down more than
one level. Each tab will be able to reset its siblings, but those update
calls to the siblings will not generate more updateTitle() calls.

Closes #73
Closes atom/atom#1663
Prepare 0.49.0 release
Merge remote-tracking branch 'origin/master' into fix-drag-tab-pass-uri