0.5 Release

This release targets Laravel 5

• switching to psr-4
• switching to phpunit & Mockery
• switching to namshi/jose as it provides gretaer control over token verification
• using carbon for date/time calculations
• abstracting the providers - (Auth, User, Storage, JWT)
• adding lots more test coverage
• completely refactoring Claim validation and Payload building
• adding support for refreshing tokens
• adding support for blacklisting tokens
• login() renamed to authenticate()
• lots of other general improvements and refactors