Added check box for selecting between all possible puzzles or only the user's preferred puzzles

Default to user's preferred puzzles
Added soft keyboard option with numbers and arrows
New automatic downloader for MGWCC puzzles
Added downloader for NYT bonus puzzle on the 1st of the month
Fixed Newsday downloader to gracefully deal with puzzles with extra, erroneous clues (like the 1/3/14 puzzle)
Set activity launch mode to singleTop
Update the database sync time after downloading new puzzles so we don't do an unnecessary database sync the next time the app is launched
Always show manual downloaders in the dropdown list
Moved 0 key to the right
Set version number to v2.1.0 and updated release notes
APK for v2.1.0