Tidy definition of RACEventTrampolinesKey
Remove unnecessary imports
Merge pull request #521 from kastiglione/extract-event-trampoline-management

Extract duplicated code for management of event trampolines
test the expected scheduler behavior
fix the signal name
Merge pull request #510 from ReactiveCocoa/ios-testing-target

iOS testing target
Implemented -ignore stream operation to filter the specified value (including nil)
Indenting according to docs
new scheduler each time
include the scheduler in the name
Testing that -ignore: works for equal objects (different pointers) using an NSMutableString
Added note about nil
fix the return docs
spell out what happens for +immediateScheduler
Merge pull request #501 from ReactiveCocoa/once

Added +once:
Added test for ignore: with nil to RACSignalSpec
Minor style fixes, add a signal name
Merge branch 'pr/528' (pull request #528)
Merge branch 'master' into 2.0-development
Remove pre-1.0 RACCommand deprecations