Merge pull request #11 from f2prateek/master

Add Convenience Methods For Orientations
Merge pull request #12 from f2prateek/master

Add Convenience Methods For Orientations (Display)
Update website and README for new convenience methods.
Link tweaks.
Start change log for next version.
Re-word.
Add Pair assert, generify some other asserts.
AttributeSet assertions.
Closing parenthesis.
Add preference assertions.

Closes #14.
Merge pull request #16 from square/jw/preferences

Add preference assertions.