Install PHP curl

Required for sensiolabs/security-checker
Capitalise "SLIMS" in page title
Fix UserResponse data element name
Containers create and update APIs #7/#9

* API endpoints for creating and updating a container.
* Migrations for updated schema structure.
* Updated fixtures.
* Add getters and setters for Container.
* Create and Update form types for Container.
* Response type for Container.
Increase colour property of Container to 7 characters

Need to include # character.