MLCP solvers and Featherstone don't have rolling friction implemented

What steps will reproduce the problem?
1. Configure the scene so that a sphere is positioned on top of a inclined 
static plane (box or trianglemesh rotated).
2. For the sphere and inclined plane, set the rolling friction parameter to any 
value greater than 0.0 
3. Switch the solver to btDantzigSolver or btMLCPSolver.

What is the expected output? What do you see instead?
The expected output is that the sphere decreases its velocity to zero. What I 
see is the rolling friction has no effect, the sphere increases its velocity 
while runs along the inclined plane.

What version of the product are you using? On what operating system?
2.82-rev2718. Windows 7 x64.

Please provide any additional information below.

Original issue reported on code.google.com by marcos.g...@gmail.com on 9 Dec 2013 at 3:20

lucas95123 / bullet

MLCP solvers and Featherstone don't have rolling friction implemented #780