HingeJoint with same min and max limit value does absolutely same as it were zeroes.

Project Steps:

1. Open the attached project
2. Open HingeJointScene with two cubes connected by a HingeJoint using limits.
3. Select the "Cube_withHinge" object and use the "Limits" slider on the "Limits Slider" behaviour. This sets the min/max limit by default to the same values between 0 and 180.
4. Notice that nothinig happens.
5. Use the "Limit Differential" slider to something greater than zero. This will set min/max to "almost" the same value with a 0...1 difference depending on the slider
6. Notice that when using the "Limits" slider the joint now reacts to changes when the min/max values are not exactly the same. This was not the case in Unity 4.

Workaround:

-Make small difference between min and max value.

Reproduced: 5.0.1f1, 5.0.0p3
Regression: 4*