Make the window property an implicitly unwrapped optional to appease the compiler
Add public access control specifiers to everything – seems like it's the only way to access methods from within unit tests
Replace the inexplicably removed XCTAssertEqualObjects with XCTAssertEqual in unit tests
Make ALLayoutItem a struct again (yay, finally!)
Merge pull request #9 from noahd/beta4

Support for Beta 4