ENH: Add Wishart and inverse Wishart distributions
DOC: Add  to stats docs.
MAINT: pep8 compliance.
TST: assert_equal -> assert_allclose
DOC: Emphasize positive definite / fix typos.
REF: Minor computational / style changes
- log(prod(…)) -> sum(log(…))
- two variable name improvements
- np.dot(x.T, x) -> np.outer(x,x)
FIX: Two bugs in rvs()
ENH: Improve inverse Wishart performance: pdf, rvs
ENH: Univariate inv-Wishart performance: pdf, rvs
FIX: Fix implementation of Wishart rvs()
REF: Style improvements.
TST: Add rvs tests
- Kolmogorov–Smirnov test against chi2, invgamma
- Comparison against manual RVS creation
ENH: More efficient inverse Wishart rvs.
BENCH: add conjugate gradient benchmarks
BENCH: improve conjugate gradient solve benchmark
BENCH: restore a commented out line
Merge pull request #4310 from bewithaman/master

'BUG:4028'
TST: restore a test that uses slogdet now that we have dropped support for older numpy versions
Merge pull request #4135 from ChadFulton/enh_wishart

ENH: Add Wishart and inverse Wishart distributions
Merge pull request #4311 from argriffing/use-numpy-slogdet

TST: restore a test that uses slogdet now that we have dropped support for older numpy versions