Add Tam High model to Mill Valley Terrain

[tedbarnett]

Place at correct geo-location all High School models:

• Wood Hall SketchUp model is here: https://github.com/TimeWalkOrg/building-mill-valley-ca-wood-hall
• Wood Auditorium model is here: https://github.com/TimeWalkOrg/building-mill-valley-ca-wood-auditorium