Improve doc for gamma functions
Remove some functionality that breaks hyperexpand
Merge pull request #2755 from smichr/mat

add quick solution for linear systems of equations
Merge pull request #2781 from hargup/bool_set

bool, relational: added as_set method
Merge pull request #2771 from asmeurer/together_iterable

Use iterable(expr) rather than hasattr(expr, '__iter__') in together()
Merge pull request #2742 from bjodah/latex_printing_of_indexed

Fixes #2627, latex printing of Indexed and IndexedBase.
resolve conflicts with merge
Merge pull request #2788 from skirpichev/pow-real-fix

Pow simplification: if x and y are >=0 then x**y is real
fixed substitution bug and added tests
clean up Set.boundary docstring
Merge pull request #2783 from smichr/geom

geometry
Added vector docs folder
Merge branch 'master' of https://github.com/sympy/sympy into vectormove
Series: Passed dummy logx parameter in _eval_nseries

This change will lose logarithmic order factors as the logx parameter
is not included in big O notation.
unXFAIL matrix test
Fix issue 2096: 1/0 should be zoo, not oo
Fix failures in series module due to substitution of zoo as Order point
Fix test failures in concrete module.  XXX: why zoo.is_number is False?
Fix Integral.as_sum: use limits to handle boundaries, not subs
Fix Rational.__div__ to return zoo if other is S.Zero and self is not