android-utils uses gradle and contains the gradle-wrapper. Hence, you can use the following gradle-commands:
build the .aar-file: ./gradlew assembleRelease
run the unit-tests: ./gradlew testReleaseUnitTest
publish build-artifacts to your local maven-repository: ./gradlew publishToMavenLocal
Publishing to other destinations should not be done manually, but only by the CI-build.