Removed RACActiveSignals checking in RACDynamicSignal.
Fixed some tests.
Removed some tests that were testing implementation details.
Isolated multicasted subscription disposal test because ARC.
This isn't needed anymore.
Add RACTuple.tail
Add RACSignal.ap
Basic test for RACSignal.ap
Document precondition of RACTuple.tail
Rename ap to apply. Don't use RACTuple.first.
Fix references to -ap
Comment that the apply block should return an object.
One more reference to -ap
Rename apply to reduceApply
Assert at least 1 arg, reword method summary.
Fix typo.
Reword comment for RACSignal.reduceApply
Remove RACTuple.tail.
Style.
Optimize -take: in case the count is 0

Comes from d87adfb (3.0-development).