Added MIT license
Added main class and constants
Added Auth class to manage user authorization process.

1. Added Auth class.
2. Added `auth` property to ColorMe.
3. Added unit tests.
4. Updated README.md about setup and authorization process.
Added Auth class to manage user authorization process.

1. Added Auth class.
2. Added `auth` property to ColorMe.
3. Added unit tests.
4. Updated README.md about setup and authorization process.
Changed ColorMe's auth property's visibility.
Merge branch 'feature/auth' into develop
Added base resource class that allows GET, POST, PUT and DELETE requests.
Refactoring: Created a response object and made simpler resource classes.

1. A ColorMe\Response\Response object is now returned to easily access data and meta-data.
2. ColorMe\Constants now separate the base API url and the different endpoints.
3. ColorMe\Resource\Resource is now in charge of building the resource URL based on the id/extension schema used by the API.
Added resources.

1. Added resources available through the API.
2. Added a `duration` property in ColorMe\Response\Response (This allows us to know how long the Api call took).
3. Refactored the resource class to throw an exception if a resource can only by accessed by id or without id.
Updated documentation.
Updated README.md about installation via Composer.
Bumped version to 1.0
Updated README.md for package version in composer.json
Merge branch 'release/v1.0'