Parametric T intersection track compatible with standard wooden train track

Parametric module to create a T-shaped intersection piece of track for Thomas- and Brio-compatible wooden train sets. Parameters allow for changing between the two standard sizes for this shape of track, as well as control over the types of connectors at each end of the track.
 
To render this shape, you will need [tracklib.scad](http://www.thingiverse.com/thing:216915) installed in the same directory as this file, or the [dotscad/trains](https://github.com/dotscad/trains) repository clon