We don't need an application element in the library

Fixes #45

Author: puf

library/src/main/AndroidManifest.xml

@@ -1,4 +1,2 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.firebase.ui">
-    <application android:allowBackup="true" android:label="@string/app_name">
-    </application>
 </manifest>