Merge pull request #2 from kfarr/master

copied png textures to collada dir

Miscellaneous extra models

Update unity-plugin to last version submitted to Unity asset store

Change fbx models to disable embedded media

Update the README

Update the unity-plugin to use fbx sources

Regenerate fbx files

Clean up some of the vox models (rotate vehicles forward, remove empty space, etc.) and dump colladas of the changes

Add FBX versions of the models

Convert all obj_* to statics

Fix broken prefabs

Rotate all the vehicles to face forward

Convert the last couple of models to unity prefabs

Add day 87 prefabs