Update Travis CI config for Android API 18.
Update Android setup for Travis CI.
Prep for 4.0.3 release.
Merge remote-tracking branch 'origin/ci-fix' into next
Revert back to snapshot, testing release strategy.
Use newer maven-release-plugin to fix issues with GitHub (maybe).
Ignore Maven relase backup files in Git.
[maven-release-plugin] prepare release v4.0.3