added sampling_density to sympy.stats
Add Benjamin Gudehus to AUTHORS/aboutus. Welcome to SymPy!
make sampling_density tests more robust
7456: make random_symbols canonically ordered
Merge pull request #7515 from smichr/density-numsamples

Added sampling_density to stats
3594:factor should return unhandled expr unchanged
don't expand for other functions like sqrt
Add shaunheilee to AUTHORS/aboutus. Welcome to SymPy!
Add Laurentiu Cristian Ion to AUTHORS/aboutus. Welcome to SymPy!
test to see if exp is Rational