Failing test case for #988, sometimes crashes with EXC_BAD_ACCESS
Code style & naming
Fixed -flatten: to not deallocate dequeueAndSubscribeIfAllowed while it's running.
Merge pull request #1 from ReactiveCocoa/flatten-last-sync-signal-bug

Fixed -flatten:.
Typo
Merge pull request #989 from corristo/flatten-last-sync-signal-bug

Fix and failing test case for #988