Add UI/UX polish in prep for merge

* Bring UI/UX inline with recent changes
* Use select components as a stopgap for credential_types and orgs
* Add tabs to permissions view
* Add Organization model

awx/ui/client/lib/models/Organization.js

@@ -0,0 +1,18 @@
+let BaseModel;
+
+function OrganizationModel (method) {
+    BaseModel.call(this, 'organizations');
+
+    return this.request(method)
+        .then(() => this);
+}
+
+function OrganizationModelLoader (_BaseModel_) {
+    BaseModel = _BaseModel_;
+
+    return OrganizationModel;
+}
+
+OrganizationModelLoader.$inject = ['BaseModel'];
+
+export default OrganizationModelLoader;