Fixed tools compilation.

Fixes errors introduced in 081e7ddd028d9382bd52c2b117dae6b6f84225e5.
Added basic style checking to Travis builds.
Travis: Added lua installation before build.
Travis style check in the right folder.
Merge pull request #1687 from mc-server/StyleCheckTravis

Style check travis
MobHeads: fixed regular head placement.
ProtoProxy: Log block change packet details.
MobHead: Fixed wither spawning.