Change js structure for displays

app/static/js/resource-displays/corpus-display.js

@@ -1,4 +1,4 @@
-class CorpusDisplay extends ResourceDisplay {
+ResourceDisplays.CorpusDisplay = class CorpusDisplay extends ResourceDisplays.BaseDisplay {
   constructor(displayElement) {
     super(displayElement);
     this.corpusId = displayElement.dataset.corpusId;

app/static/js/resource-displays/index.js

@@ -1,4 +1,6 @@
-class ResourceDisplay {
+var ResourceDisplays = {};
+
+ResourceDisplays.BaseDisplay = class BaseDisplay {
   constructor(displayElement) {
     this.displayElement = displayElement;
     this.userId = this.displayElement.dataset.userId;
@@ -41,4 +43,4 @@ class ResourceDisplay {
       this.setElement(element, value);
     }
   }
-}
+};

app/static/js/resource-displays/job-display.js

@@ -1,4 +1,4 @@
-class JobDisplay extends ResourceDisplay {
+ResourceDisplays.JobDisplay = class JobDisplay extends ResourceDisplays.BaseDisplay {
   constructor(displayElement) {
     super(displayElement);
     this.jobId = this.displayElement.dataset.jobId;