Misc fixes (#244)

* cleared up docs

* fix 401 bug for images thumbnail

src/ApiClient.ts

@@ -43,6 +43,11 @@ export class ApiClient {
         });
     }
 
+    /**
+     * Used to initialize/retrive the active ApiClient
+     *
+     * @param session used if initializing
+     */
     public static getInstance(session?: Session): ApiClient {
         if (!ApiClient.instance) {
             ApiClient.instance = new ApiClient(session);
@@ -51,6 +56,16 @@ export class ApiClient {
         return ApiClient.instance;
     }
 
+    public setSession(session: Session): void {
+        if (!ApiClient.instance) {
+            logger.warn("Trying to update ApiCient session when it's not initialized!");
+        }
+
+        this.session = session;
+
+        return;
+    }
+
     /**
      * Call Microsoft Stream API. Base URL is sourced from
      * the session object and prepended automatically.