Added ReactiveCocoa to Podfile.
Add retina launch image to sample app.
Fix deprecated API calls.
Reactive extensions for channels - vend signals for events.
A very simple example that uses ReactiveExtensions and signal binding.
Add Reactive bindings support to the client.
Provide signals for *all* events on a client or channel.

There are important memory management caveats here due to the signal
being based on notifications, which are infinite signals.
Switch from notifications to allEvents signals and demonstrate how
to safely dispose of a subscription to this signal.
Define a sub-spec for ReactiveExtensions.

The Core sub spec is set as the default as we do not want to include
ReactiveExtensions by default.
Split ReactiveExtensions out into a separate static library.
Correctly exclude private headers.
Re-add private headers to OSX project
Merge pull request #125 from lukeredpath/reactive-extensions

Experimental Reactive Extensions