[RFR] Allow a field to be pinned (used in new filters)

lib/Field/Field.js

@@ -14,6 +14,7 @@ class Field {
         this._defaultValue = null;
         this._editable = true;
         this._detailLinkRoute = 'edit';
+        this._pinned = false;
         this.dashboard = true;
         this.list = true;
     }
@@ -163,6 +164,12 @@ class Field {
         this._detailLinkRoute = route;
         return this;
     }
+
+    pinned(pinned) {
+        if (!arguments.length) return this._pinned;
+        this._pinned = pinned;
+        return this;
+    }
 }
 
 export default Field;