Fixed Travis publication.
Made logger use more uniform (fixes #255).
Fixed disconnect when sending empty chunks.
Changed sound radius to be min(volume * 16, 16).
Added block placement handling for ladders and vines (see #119).
Added CONTRIBUTING.md (thanks @JeromSar).
block physics
reformatting code
added notify when a block breaks/changes it's type; setting data will call the functions as well
first version of block physics
Fixed formatting finally