add .travis.yml for Tavis-CI integration.
add example project to resolve compile error in pac-conference-web
module.
add central project for persistence unit configuration.
removed not used meta-inf files.
add interfaces for Location, Room and corresponding Services. Add first
implementation of LocationService.
sql script for location domain.
add new submodules.
add new dependencies.
add new central submodule for tests.
extended dependencies to example submodule to avoid compile errors.
add dependencie to submodules.