Add buttons for switching JSON preview style

app/controllers/inspect.js

@@ -1,7 +1,9 @@
 import Controller from '@ember/controller';
 import { inject as controller } from '@ember/controller';
 import { inject as service } from '@ember/service';
+import { computed } from '@ember/object';
 import { alias } from '@ember/object/computed';
+import { isEmpty } from '@ember/utils';
 
 export default Controller.extend({
 
@@ -12,8 +14,26 @@ export default Controller.extend({
 
   queryParams: ['path'],
 
+  documentIsJSON: computed('model.documentMetaData.type', function(){
+    if (isEmpty(this.get('model.documentMetaData'))) { return false; }
+
+    return !!this.get('model.documentMetaData.type').match(/application\/json/i);
+  }),
+
+  jsonView: 'source',
+  jsonShowTree: computed.equal('jsonView', 'tree'),
+  jsonShowSource: computed.equal('jsonView', 'source'),
+
   actions: {
 
+    showJsonTree () {
+      this.set('jsonView', 'tree');
+    },
+
+    showJsonSource () {
+      this.set('jsonView', 'source');
+    },
+
     deleteItem () {
       if (window.confirm('Sure?')) {
         this.get('storage.client')