Change prtRvUniform to accept upper bound == lower bound

[peterTorrione]

Right now this causes an error:

>> r = prtRvUniform('lowerBounds',25,'upperBounds',25)
>> r.draw
Error using prtRvUniform/draw (line 118)
DRAW cannot yet be evaluated. This RV is not yet valid because at least one entry of lowerBounds is greater than the corresponding entry of upperBounds.

First - the error message is wrong. Should be "Greater than or equal to". But even so, I think this should work (even if the resulting uniform is improper, and can be well represented by a prtRvDiscrete). I think the change is on line 138:

badOrder = ~all(R.upperBounds>=R.lowerBounds);

Any objections?

[patrickkwang]

Seems reasonable to me.