small fixes
Merge branch 'master' of https://github.com/valentinvs/BaloonsPop
Merge branch 'master' of https://github.com/valentinvs/BaloonsPop
Merge branch 'master' of https://github.com/valentinvs/BaloonsPop
Merge branch 'master' of https://github.com/valentinvs/BaloonsPop
Merge branch 'master' of https://github.com/valentinvs/BaloonsPop
add BalloonTests