Copyright (c) 2003-2010 Erwin Coumans  http://continuousphysics.com/Bullet/

This software is provided 'as-is', without any express or implied warranty.
In no event will the authors be held liable for any damages arising from the use of this software.
Permission is granted to anyone to use this software for any purpose, 
including commercial applications, and to alter it and redistribute it freely, 
subject to the following restrictions:

1. The origin of  this software must not  be misrepresented; you must  not claim
that you wrote the original software. If you use this software in a product,  an
acknowledgment in  the product  documentation would  be appreciated  but is  not
required. 

2. Altered source  versions must be plainly  marked as such, and  must
not be misrepresented as being the original software.

3. This notice may not be removed or altered from any source distribution.
