MAINT: avoid spurious warnings in binom(n, p=0).mean() etc

closes gh-3817
DOC: typo
BUG: Fix tests that expect numpy 1.9 to implement __numpy_ufunc__.

Change Numpy version tests to check for 1.10 instead.
DEP: Disable sparse inplace DeprecationWarnings for Numpy < 1.10.

I'm not sure that this is __numpy_ufunc__ dependent, but I suspect
so.
Merge pull request #3850 from argriffing/eig-docstring-typo

DOC: typo in linalg.eig docstring
Merge pull request #3820 from ev-br/binom_warn

MAINT: avoid spurious warnings in binom(n, p=0).mean() etc
Merge pull request #3859 from charris/update-numpy-ufunc-version

BUG: Fix tests that expect numpy 1.9 to implement __numpy_ufunc__.
DOC: document default argument values for some arpack functions
Merge pull request #3851 from argriffing/arpack-default-docstrings

DOC: document default argument values for some arpack functions