[META] phase 2

[oliverklee]

This meta ticket covers the rest-api-related tasks for phase 2. The core-specific tasks are listed in phpList/core#125, the base-distribution-specific tasks are listed in phpList/base-distribution#18, the the web-distribution-specific tasks are listed in phpList/web-frontend#16.

• [BUGFIX] Import the database after the composer install #21 fix the MySQL DB import in Travis
• [BUGFIX] Remove the composer.lock again #22 make sure Composer installs the latest version of the dependencies (was a packagist configuration issue)
• [BUGFIX] Fix MySQL with the new Trusty Travis images #23 get the Travis builds to work on Trusty
• [BUGFIX] Return HTTP status 400 on bad client data instead of 500 #24 return error 400 for bad data, not a 500
• [TASK] Return the application/json content type for REST responses #25 return a JSON content type for the response
• [TASK] Change the master branch alias to 4.0.x-dev #26 rename the branch alias from 4.0.0-dev to 4.0.x-dev https://getcomposer.org/doc/articles/aliases.md#branch-alias
• [FEATURE] Add the Symfony console and the public web/ directory #28 add the Symfony console
• Add host URL documentation to RestApi.apib #29, [TASK] Document the HOST and prefix in the REST API documentation #31 add host URL documentation
• [FEATURE] Autogenerate the bundle configuration file #37 make this bundle known to the core
• [FEATURE] Autogenerate the bundle configuration file #37 use the module registration hook
• [FEATURE] Routes configuration #40 move the REST routing configuration to the rest-api package
• [TASK] Switch the REST API to the FOSRestBundle #56 switch to FOSRestBundle
• [FEATURE] REST route for retrieving all subscriber lists #62 finish the authentication, AKA REST API for handling authentication
• [FEATURE] REST route for retrieving all subscriber lists #62, REST API for reading lists and creating subscribers