Add gradle building support
update maven plug in version
[maven-release-plugin] prepare release UndoBar-Parent-0.4
[maven-release-plugin] prepare for next development iteration
Merge branch 'master' of https://github.com/soarcn/UndoBar
[maven-release-plugin] prepare release UndoBar-Parent-0.4
prepare for maven release
[maven-release-plugin] prepare release 0.4
[maven-release-plugin] prepare for next development iteration