Removed allowBack because this attribute is not required by library

library/src/main/AndroidManifest.xml

@@ -1,6 +1,3 @@
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.afollestad.materialdialogs">
-
-    <application android:allowBackup="true" />
+<manifest package="com.afollestad.materialdialogs" >
 
 </manifest>