Bulk Add to Collection (#674)

* Fixed the typeahead not having the same size input box as other inputs

* Implemented the ability to add multiple series to a collection through bulk operations flow. Updated book parser to handle "@import url('...');" syntax as well as @import '...';

* Implemented the ability to create a new Collection tag via bulk operations flow.

API/Controllers/OPDSController.cs

@@ -6,6 +6,7 @@ using System.Threading.Tasks;
 using System.Xml.Serialization;
 using API.Comparators;
 using API.DTOs;
+using API.DTOs.CollectionTags;
 using API.DTOs.Filtering;
 using API.DTOs.OPDS;
 using API.Entities;