Merge branch 'feature/doctrines', implements and closes #18.

Added Doctrine entities and database mappings.

Added repository operations for doctrines.

Minor changes to repository operations for eager loading and ordering.

Service layer methods for retrieving doctrines.

Added doctrine list and detail pages.

Change of navigation menu structure.

Compiled CSS file.

Minor style changes.

Doctrine repository operations change for ordering the doctrines retrieved.

Minor doctrine page improvements.

Added a corner tag image and related styles for official doctrines.

Added a default image for doctrines without a custom image.

Doctrine account admin page and supporting service and repository layer methods.

Added a default image to the doctrine detail page.

Doctrine admin page update dialogs.

Official tag image changed to support browsers such as the EVE IGB without CSS radius support.

Associated doctrines are now deleted with their account.

Doctrine modification dialog and supporting service layer methods.

Doctrine ship fit list modification dialogs and supporting service layer methods.

Minor modification to ship fit validation.

Moved certain useful json-returning methods to a new api controller.

Changed ship fit page css class names to lowercase to standardise.

Added note to admin pages regarding delayed visibility of modifications due to caching.