Some small updates

♡ Added Xcode project file that builds a static library, properly sets preference of tabs instead of spaces, and just makes it easier to work with the project
✔ Fixed Xcode 4.6 error for capturing self
✔ Clean up imports a little (no need to have UIKit everywhere)
Move source into subfolder
Update podspec
Merge branch 'master' of git://github.com/soffes/sspulltorefresh