Revert "Added RACNamedSequence()"

This reverts commit 07fe5bca544fb5f90bd943571c87c3c56dc44068.
Revert "Added RACNamedSignal() to declare and name a signal"

This reverts commit d50482db69845f00a88392b434947edb3e38c418.

Conflicts:
	ReactiveCocoaFramework/ReactiveCocoaTests/RACSignalSpec.m
Merge branch 'easier-signal-naming' into replay-last