some formatting fixes in recurr.py
cleanup solvers.rst for rsolve
A bit more cleanup for recurr.py
Delete leading spaces for module documentation (recurr)
Fix typo
Don't use -qq with apt-get in .travis.yml

This should prevent timeouts from no output in 10 minutes.  Travis
automatically folds this output, so it's not a big deal.
Merge pull request #2215 from skirpichev/recurr.py-docs

LaTeX docstrings for rsolve
Add Francesco Bonazzi to the AUTHORS/aboutus/.mailmap. Welcome to SymPy!
Merge pull request #2280 from asmeurer/travis_doc

Don't use -qq with apt-get in .travis.yml
Improve the atan2 function
Simplified evaluation of atan2
Some more special values of atan2
Remove more argument name confusion
Fix doctests
Improve atan2 special values
Numerically evaluate atan2 for real arguments only
Adapt atan2 tests to refined special values, add test for mpmath evaluation.