Merge pull request #7 from natsuo/master

Fixes #6: Adds ability to change 'To:' label
Added UIAppearance methods for recipients

Now you can style the recipients background image, content insets and title text attributes.

In order to better facilitate the title text attributes flexibility, we changed to using `NSAttributedString` for the `UIButton`s.

Addresses #3
Added UIAppearance for to label

Now the to label's text attributes can be styled with UIAppearance.

Closes #3
Fixed example app for 3.5 inch screens

To demonstrate what would happen if a height limit was reached, we set a minimum height on our example view. Unfortunately this heigh is far too large for the smaller 3.5 inch screen.

I lowered the minimum size so that it would work on both devices.

Closes #8
Fixed scrolling

The example app was configured incorrectly, and caused the recipients bar to never be forced into a smaller size. The constraint was corrected to be required, and now it scrolls just fine.

Closes #9
Added podspec

I will be submitting this podspec to the main repo. See [Cocoapods](http://cocoapods.org).
Removed every reference to "compose"

Bad naming will follow you to your grave.
Added examples and fixes for UIAppearance

There are now examples to change the appearance of the recipients bar. Also, a few bugs were found related to trying to set a nil appearance which have been fixed.
Update README

Bunch of examples and installation instructions.