Prepare Changelog on master
Merge remote-tracking branch 'upstream/release'
fix some compiler warnings
remove unneeded suppresswarnings

Eclipse does not show a warning if the parameter is documented in the
JavaDoc. If your IDE shows warnings about these parameters now after the
change, consider upgrading.
fix remaining warnings or document them
silence Findbugs warning

Findbugs issues an unused object warning, therefore go without an object
assignment and have the suppressWarnings at the method level.
Merge branch 'release' into upstream
Upgrade to RxJava 0.17.6
Take advantage of RxJava's renewed Android operators
cleanup: remove unused import
upgrade commons lang to 3.3.2
#3777: fix CI test
#3777: fix CI test
Stop all images tab downloads in onDestroy()
work on #3780: do not reload caches to get their attributes

The attributes are lazily loaded, so they will always be up-to-date.
crowdin: New translations
Merge pull request #3781 from rsudev/crowdin_translations

crowdin: New translations
new: integrate mapswithme
upgrade to butterknife 5.0.0
Add mapswithme-api to Intellij IDEA

Also fix cgeo-contacts settings.