big cleanup
cleanup
done by scm
cleanup and migrate to play services analytics
add butterknife - bump versions
use butterknife
cleanup ( big AXE ) in the cloud stuff
handler -> runOnUiThread
rename
rename
use optional and not null as return value
rename
use diamond
allow non consecutive next tsumego find
add ui tests and restructure
add tools text
initial support of difficulty
listing / testing
android:text -> tools:text
add travis.yml