Merge pull request #3 from adamantivm/refactor-hokuyo-package

Fix #2 - refactor hokuyo to proper package name
ros-java -> rosjava migration.
there is no doc subproject.
move maven repos: robotbrains -> rosjava
Merge branch 'hydro-devel' of https://github.com/rosjava/rosjava_extras into hydro-devel
configure to use the gradle daemon.