Settings: Improved UX when viewing open source license info.

Added spinning progress indicator to the open source license dialog.
The actual file loading is now handled by a separate thread, in
order to provide user feedback and reduce risk for ANR.

Change-Id: Ia12727ecc2fe8114e0d1384769b568142c8a1db6
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 6746ac9..e33cc52 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -330,7 +330,8 @@
 
         <activity android:name="SettingsLicenseActivity"
                 android:label="@string/settings_license_activity_title"
-                android:theme="@*android:style/Theme.Dialog.Alert">
+                android:theme="@*android:style/Theme.Dialog.Alert"
+                android:configChanges="orientation">
             <intent-filter>
                 <action android:name="android.settings.LICENSE" />
                 <category android:name="android.intent.category.DEFAULT" />