Generate documentation for all modules (this only works right now if PhpDocumentor2 is hacked to disable graph generation).

Created separate phpcs task; adjusted which files get style-checked (all modules, minus tests and configurations).

Added unit tests for upgrade code; put old configurations from 1.x releases into test fixtures to support tests.

Added new upgrade functionality to match 1.4 upgrader and to make \VuFind\Config\Upgrade class easier to test.

Switched to dependency injection instead of reliance on service locator.
Improved mobile URL generation with additional regular expressions.

- Moved database-authentication-specific checkPassword method out of user row object and into auth object
- Eliminated direct access to cat_password property of user row object by using getters/setters

Now that theme logic has its own module, changed the namespace of the view helpers to something more logical.

Changed theme configuration to use PHP files instead of .ini files in order to allow more flexible helper configuration.

Eliminated unnecessary ServiceLocator/ConfigReader in VuFind\Cart; dependencies and configuration are now injected through constructor.

Removed arbitrary VuFind\Cart reference in MultiAuthTest to prevent confusion; added test involving bad service name.