added LICENSE.txt and AUTHORS.txt file

add MultiBody Custom Creation example, to show how to import data from a URDF file and fill up your own data structures.
add btMultiBody::setBaseWorldTransform method
todo: fix cmake build, this patch is premake only

examples/Importers/ImportURDFDemo/MyMultiBodyCreator.h

@@ -43,6 +43,7 @@ public:
     virtual void addLinkMapping(int urdfLinkIndex, int mbLinkIndex);
 
 	btMultiBody* getBulletMultiBody();
+
 };
 
 #endif //MY_MULTIBODY_CREATOR