[Plugin for MultiPicture Live Wallpaper]
(http://www.tamanegi.org/prog/android-apps/mplwp-plugins.html#mplwp-picasa)
show pictures from Picasa Web Album.
This plugin needs [MultiPicture Live Wallpaper]
(http://www.tamanegi.org/prog/android-apps/mplwp.html) v0.5.1 or later.
copy keystore.properties.template to ../keystore.properties,
and edit it.
run
./gradlew build