DOC: attempt to fix docstring markup for references but this is not tested
MAINT: delete commented-out values of theta which are not used; these could be added back if we want frechet derivatives
MAINT: the old logm is now completely replaced
BUG: fix a bug in my assert_raises usage
MAINT: change an exception to a warning so that the scipy.sparse.linalg tests pass
DOC: poisson distribution is an
Merge pull request #2575 from cowlicks/nnz-type

BUG: Homogenezie nnz type to be int for all sparse matrix types.
Merge pull request #2504 from bburlo/blas3

ENH: linalg: expose a part of blas3 functionality
DOC: linalg: add BLAS level 3 routines to docs
BUG: start abusing travis
API: Change sparse matrix __bool__ & __nonzero__ to raise a ValueError
the same way NumPy does.
TST: Fixed a nonrelevant error that occured relating to a change in sparse.
TST: Tests for __bool__.
MAINT: fix test failures and warning spam by being less clever when the principal branch does not exist, for the matrix functions that use inverse scaling and squaring
Merge pull request #2578 from bburlo/poisson_doc

DOC: docstring example in stats.distributions
MAINT: add assertions of upper triangular matrix invariants
MAINT: use solve_triangular when applicable
MAINT: use solve_triangular when applicable in expm
BUG: Change Spares' sum and mean methods to match Numpy's buhavior.
TST: Tests for the changed sum and mean methods.