Add Config model

* Add ability to configurably cache API responses per model
* Fix general error display on credentials
* Add current version from API to the documentation link

awx/ui/client/lib/services/cache.service.js

@@ -0,0 +1,37 @@
+function CacheService ($cacheFactory, $q) {
+    let cache = $cacheFactory('api');
+
+    this.put = (key, data) => {
+        return cache.put(key, data); 
+    };
+
+    this.get = (key) => {
+        return $q.resolve(cache.get(key));
+    };
+
+    this.remove = (key) => {
+        if (!key) { 
+            return cache.removeAll();
+        }
+
+        return cache.remove(key);
+    };
+
+    this.createKey = (method, path, resource) => {
+        let key = `${method.toUpperCase()}.${path}`;
+
+        if (resource) {
+            if (resource.id) {
+                key += `${resource.id}/`;
+            } else if (Number(resource)) {
+                key += `${resource}/`;
+            }
+        }
+
+        return key;
+    }
+}
+
+CacheService.$inject = ['$cacheFactory', '$q'];
+
+export default CacheService;

awx/ui/client/lib/services/index.js

@@ -1,3 +1,4 @@
+import CacheService from './cache.service';
 import EventService from './event.service';
 import PathService from './path.service';
 import BaseStringService from './base-string.service';
@@ -5,7 +6,8 @@ import AppStrings from './app.strings';
 
 angular
     .module('at.lib.services', [])
-    .service('EventService', EventService)
-    .service('PathService', PathService)
+    .service('AppStrings', AppStrings)
     .service('BaseStringService', BaseStringService)
-    .service('AppStrings', AppStrings);
+    .service('CacheService', CacheService)
+    .service('EventService', EventService)
+    .service('PathService', PathService);