Add Player entity
Add Cell entity
Changed x and y property to final, to avoid changes of these properties
Add Ship entity
Add Grid entity
Fixed codestyle messages from FindBugs (spaces instead of tabs, ..)
Add sonar project settings and runner executer
Ignore sonar temp folder
Add comments to public APIs
Extend models with relationships
Add tests for model relationships
Merge branch 'add-models'
Integrate Maven build config
Merge remote-tracking branch 'origin/master'
Use jdk 1.7 in maven
Fixed jdk 1.7
Remove toolchain
Add junit to maven
Use old 1.6 standard
Add maven test config