This release of Quick contains major breaking changes that are
incompatible with the v0.1.0-beta API.

Specifically, shared examples are no longer defined within a
`QuickSharedExampleGroups` subclass. Instead, shared examples may be
defined within a subclass of `QuickConfiguration`.

Other updates include:

- Fixes for breaking changes introduced by new Xcode versions. This
  version of Quick supports Xcode 6.0, 6.1, and 6.1.1 GM.
- Nimble (the matcher framework) is maintained as an external
  library. Quick may be used independent of Nimble.
- Objective-C shorthand is enabled by default (i.e.: `it`, instead of
  `qck_it`).
- Quick itself is tested via functional tests.
- Improved documentation and README.