Add objectPassingTest
Style Fixes
Merge pull request #377 from aitskovi/objectPassingTest

Add objectPassingTest
Export NSObject+RACDeallocating.h

export the herder file both OSX and iOS.
import NSObject+RACDeallocating.h in ReactiveCocoa.h
Merge pull request #382 from kkazuo/xcode-header-export

Export NSObject+RACDeallocating.h
Add convenience method for delayed schedule on RACScheduler

Method `-after:schedule:` takes dispatch_time_t argument that is in nanoseconds.
New method `-delay:schedule:` takes NSTimeInterval as argument (in seconds) and
calls `-after:schedule:` with calculated dispatch time. Method is implemented
in suberclass and is not abstract.
Update README.md
implemented forwarding of completed and error events to RACGroupedSignal when using -groupBy:
improved source code
Merge pull request #390 from zlajo/feature/group_by_event_forwarding

implemented forwarding of completed and error events to RACGroupedSignal when using -groupBy:
less lulzy RAC-less parallel work example

h/t @ddeville
Mention that iOS targets need -ObjC
style.
Merge pull request #395 from ReactiveCocoa/readme-objc

Update README to mention that iOS targets need -ObjC Linker Flag
Rename `-delay:schedule:` -> `-afterDelay:schedule:`
Merge pull request #391 from ReactiveCocoa/less-lulzy-example

Less lulzy RAC-less parallel work example
Merge pull request #386 from iMartinKiss/feature/delay-scheduler

Add convenience method for delayed schedule on RACScheduler
Add method `-includePrevious:` for combining latest value and previous values

maps the combination of given number of previous values and the latest value
to one object `RACTuple`.
Add `-includePrevious:withStart:` to be able to specify initial placeholder value