gradle.properties: ready for 3.3.0-alpha5 build

gradle.properties: ready for 3.3.0-alpha4 build

gradle.properties: ready for 3.3.0-alpha3 build

gradle.properties: ready for 3.2.4-stable build

trivial commit with tag for v3.3.0-alpha2

trivial commit with tag

gradle.properties: ready for 3.2.3-stable build

gradle.properties: ready for 3.2.2-stable build

.travis.yml: work around Travis's tag blindness using a regexp

release