Added UIKit extensions

[avalanched]

No description provided.

[neilpa]

These are great! Thanks for the PR.

I can cut a new release with these if you'd like. Otherwise I was waiting for the RAC 4 alpha 2.

[avalanched]

waiting for alpha 2 is just fine for me. I will try to add some more the coming days.

[neilpa]

I will try to add some more the coming days.

😄

[bjarkehs]

Out of curiosity: How do the retain cycle tests work?
Nvm, I just realized it was all in the tearDown. 👍

[avalanched]

@bjarkehs in the tearDown you check if the object is successfully deallocated, there was a retain cycle issue in a previous build when binding a property, this was fixed in #28

[bjarkehs]

@avalanched Yeah, I edited my own comment a few seconds before your response. Had not expected anyone to respond this quickly. Anyway, thanks for the added properties 😄