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/DTOs/SeriesMetadataDto.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using API.DTOs.CollectionTags;
 using API.Entities;
 
 namespace API.DTOs