v0.1.0-beta

This is the first "official" release of the Quick testing framework. It
works with Xcode 6 beta 2 (6A216f) and includes the following features:

- Example groups: `describe` and `context`
- Group setup and teardown: `beforeEach` and `afterEach`
- Suite setup and teardown: `beforeSuite` and `afterSuite`
- Examples: `it`
- Shared examples: `sharedExamples` and `itBehavesLike`
- Expectations: `expect(...).to`
- Asynchronous expectations: `expect{...}.will`
- Basic matchers, such as `equal` and `beTrue`
- The `raise` matcher
- Custom output formatters
- User-defined matchers

The Swift API will be versioned from this point forward. Any breaking
changes will be tagged as version 0.2.0, 0.3.0, and so on. Backward
compatible changes will be bundled and released as versions 0.1.1,
0.1.2, and so on.

The Objective-C API will remain unstable. Breaking changes may be
introduced at any time.