0.0.6: added highlight 007 usage with block place preview

bumped version to 0.0.6

block erase and place now use highlight data passed by callbacks

block placement position is highlighted as empty wireframe when control key is pressed

![highlight_adjacent](https://f.cloud.github.com/assets/768409/241439/232171ce-89ae-11e2-913c-25ca9afd0baa.png)