Consider:
```
>>> from sympy import *
>>> from sympy.stats import *
>>> t = Symbol('t')
>>> n = Uniform('n', 0, 1)
>>> print(density(n + n)(t))
Piecewise((1, (0 <= t/2) & (t/2 <= 1)), (0, True))/2
```
This is a uniform distribution from 0 to 2.
Am I misunderstanding what the sum of two random variables represents in sympy,
or is this totally wrong? I would expect the result to be a triangular
distribution
<https://math.stackexchange.com/questions/357672/density-of-sum-of-two-uniform-random-variables-0-1>.
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