fix docstring of AddWithLimits
Add Aditya Shah to AUTHORS/aboutus. Welcome to SymPy!
setup.py: clean should remove sample.tex
Travis: remove pypy from allow_failures
Merge pull request #2968 from zanzibar7/AddWithLimits_docstring

fix docstring of AddWithLimits
travis: use versioned archive for theano
Merge pull request #2960 from skirpichev/misc

Misc minor changes
Use builtin hash(Integer.p) to compute hash(Integer), see issue 1973
Use cmp_to_key(Basic.compare) in _addsort, like _mulsort in mul.py