Add quotes to header search paths
Clarify -deliverOn: and -subscribeOn:

Specifically, promote -deliverOn: over -subscribeOn:, since the latter
is rarely right.
Only do work in -rac_description in DEBUG builds
Avoid -rac_description within -description

Since it now doesn't do anything in Debug builds.
Refactor RACCompoundDisposable to use CFArray

Results in a significant performance gain when lots of compound
disposables are in use (and especially nested).
Replace @onExit with try/finally to avoid blocks overhead
Pull disposable arrays out onto the stack for enumeration
Meh, we don't really need exception safety here
Optimize KVO trampoline storage
Set iOS deployment target to 5.0
Add SDK requirements to README
Clean-up duplicate entries in ReactiveCocoaTests
Optimize active signals set
Remove unused tearingDown property
Use cheaper synchronization for RACSignal's subscribers array
Move didSubscribe block declaration into RACSignal.m
Prefer -addDisposable over +compoundDisposableWithDisposables:
Revert "Pull disposable arrays out onto the stack for enumeration"

This reverts commit 520e54ddd8ce3bec64bf18527755b8ab5bce08c8.

Conflicts:
	ReactiveCocoaFramework/ReactiveCocoa/RACCompoundDisposable.m
Removed NSTask+RACSupport.