TestMath

$$ \mu * \frac{ F_{t} }{ F_{n} } $$
 * 1) math extension test

$$ x_1 = x_0 + dt*\dot{x} $$


 * 1) include extension test

[original text](http://bitbucket.org/osrf/gazebo/raw/john/doc/math_test.md)  
 * 1) nopre
 * 1) parsed

[original text](http://bitbucket.org/osrf/gazebo/raw/john/doc/math_test.md)  
 * 1) nopre wikitext
 * 1) parsed

[original text](http://bitbucket.org/osrf/gazebo/raw/f14ace0428dbb6214cd5024e2d9499cc4443ee7b/doc/math_test.md)  
 * 1) nopre with mathtag
 * 1) parsed

 
 * 1) Steve test