New methods:

• amActingAs
• assertAuthenticatedAs
• assertCredentials
• assertInvalidCredentials
• dontSeeInSession
• dontSeeSessionHasValues
• enableMiddleware
• flushSession
• haveInSession
• seedDatabase

Non-logical changes:

• added missing docs and fixed broken links.

This release includes a general refactoring of the code (#30) that makes it easier to navigate and read, especially using an IDE.

See the full list of changes here.