Removed RACActiveSignals checking in RACDynamicSignal.
Fixed some tests.
Removed mentions of signals being retained by the framework from the docs.
Merge branch 'remove-automatic-disposal-on-deallocation' into remove-racactivesignals
Removed the hacky workarounds for the tests.
Merge pull request #1151 from ReactiveCocoa/remove-racactivesignals

Remove RACActiveSignals