Binomial coeff are not expanded by default
Made some fixes, updated some tests
Added functions for dnf format, added simplification tweak
Fixed doctest. Added tests, documentation and doctest
Condensed common code
Rectified errors in doc examples
Rewrote docstring
Merge branch 'master' of https://github.com/sympy/sympy into binomial-iss3544
Changed the test to check for func
Added tests
Modified _distribute
Rectified docs error in _is_form
Fixed issue 3538. Subs working in .n()
Added test
In use2to3, only use WindowsError in Windows

Fixes issue 3457.
Made docs and formatting changes
pep8 change and .mailmap modification
Merge pull request #11 from smichr/dnf

pep8 change and .mailmap modification
Merge pull request #1730 from srjoglekar246/dnf

Functions for Disjunctive Normal Form
add stirling test to wester