Changed the name in application drawer.

Now the app is labeled "TODOs" (@string/app_name) and not "Login" (@string/title_activity_login) in the application drawer.
Before:
![old](https://f.cloud.github.com/assets/284197/612267/cb9192de-cde8-11e2-8ba1-092036e9a235.png)
After:
![new](https://f.cloud.github.com/assets/284197/612268/d04fbfb2-cde8-11e2-96c8-866652b3e385.png)