Add functions to the Sphinx docs
Fixed Sphinx error, hopefully
Docs imporved
Fixed Doc errors
Fixed a bug
Hopefully, the Sphinx docs are fixed
Sphinx Docs
Merge pull request #2392 from stefanv/fix_mechanics_printer

Fix up mechanics printer.
Add Stefan van der Walt to AUTHORS/aboutus. Welcome to SymPy!
Merge remote-tracking branch 'sympy/master' into derivsubs

Conflicts:
	sympy/core/function.py
Fix _extract_facts: don't fail if expr is bool
Fix @slow failure in test_query.
Merge pull request #2389 from asmeurer/polysbench

Explicitly define variables in the polys benchmark
Moved matching of user defined infinitesimals to classify_ode
Fix issue 3633: raise if assumptions are not satisfable
Fixed a typo
Made the following changes
1] Added ode_1st_power_series for first order differential equations
Merge branch 'master' into HEAD

Conflicts:
	sympy/printing/theanocode.py
Adding more functionality to RootSystem
Removed old commented out lines