Change version to 2.0.2beta1
New night mode icons.

This commit adds two new icons for night mode on/off status. The icons
represent the moon and the sun, and they are meant to indicate the state
the user will transition to, i.e., the moon icon is used to enable night
more and the sun icon is used to disable night mode.

Also add the original files at 320x320 resolution the icons were created
from, as well as a simple script to generate the assets at the various
resolutions.

The icons were created by Flavio Lerda (flerda@gmail.com) and are
released under the same copyright as the AnkiDroid source code.
Don't show deck upgrade wizard on AnkiDroid version upgrade.

The upgrade wizard will stlil appear on any startup if you have no collection.anki2 file and at least one old .anki file in the AnkiDroid directory. There is also a menu option to manually trigger the wizard.
Add automatic database check on version upgrade.
Release notes screen for 2.0.2.
Issue 1840 - Handle thread cancellation exception
Bumped version to 2.0.2beta2
Bumped version code so that the APK can be uploaded to the new Play Store beta feature
Check collection is open before using it in count handler post-execute.
Fixes Issue 1834.
Issue 1820 - disable clipboard if any exception is thrown
Bumped version to 2.0.2beta3
Bumped version to 2.0.2beta3
Increment version code too
Updated localizations from http://crowdin.net/project/ankidroid using update-localizations.py
Bumped version to 2.0.2beta4
New screenshots, reorganized for Play Store localization
Support Nook HD and Nook HD+
More screenshots
Bumped version to 2.0.2beta5
New localizations from Crowdin