Blender to Unity Converter:

https://github.com/EdyJ/blender-to-unity3d-importer

Unity/git:

http://stackoverflow.com/questions/21573405/how-to-prepare-a-unity-project-for-git

git LFS:

Windows:

Run Setup from git-lfs.github.com

OS X:

Download from git-lfs.github.com, brew install git-lfs and then git lfs install.

Use git lfs fetch to get files after installing the LFS extension.