Edit collection (#173)

* Collection edit modal

* Add icon

* 💚

* Oh look, some specs

* Delete collection

* Remove from collection

* Handle error responses
Protect against deleting last collection

* Fix key

* 💚

* Keyboard navigate documents list

* Add missing database constraints

frontend/components/DocumentList/DocumentList.js

@@ -2,6 +2,7 @@
 import React from 'react';
 import Document from 'models/Document';
 import DocumentPreview from 'components/DocumentPreview';
+import ArrowKeyNavigation from 'boundless-arrow-key-navigation';
 
 class DocumentList extends React.Component {
   props: {
@@ -10,12 +11,15 @@ class DocumentList extends React.Component {
 
   render() {
     return (
-      <div>
+      <ArrowKeyNavigation
+        mode={ArrowKeyNavigation.mode.VERTICAL}
+        defaultActiveChildIndex={0}
+      >
         {this.props.documents &&
           this.props.documents.map(document => (
             <DocumentPreview key={document.id} document={document} />
           ))}
-      </div>
+      </ArrowKeyNavigation>
     );
   }
 }