Fix lexicon browse list ordering

Fixes #45.
Restore Amazon badge image
Fix Lexicon Favorites list ordering

Fixes #49.
Remove debug logging and optimize imports
Add version number in About dialog

Closes #51.
Improve Gradle build file

It's no longer necessary to comment out the release-related lines when
creating a debug build.
Update readme
Add settings menu.

Closes #22. The About dialog has not yet been merged into the settings menu.
Move About dialog to Settings menu

Closes #55, but see #56.
Update SQLiteAssetHelper

We now use the version of the SQLiteAssetHelper library hosted on Maven
Central.
Update lexicon database.

This commit adds version 2 of the lexicon database, which was created using
GRDBC 1.1.1. The database updates fix errors in the text related to Greek
numerals and add the greekLowercase column to the index.

Closes #53 and addresses #52.
Update manifest for 1.1.0.
Update readme.