ENH: allow sparse __rmul__ to work with custom types
BUG: special: fix asymptotic expansion in rgamma
BUG: special: fix several issues in poch

Handle better the cases where the gamma functions in the definition hit
poles or over/underflow.

Fixes gh-1437
GEN: special: regenerate files
DOC: enhanced fftpack tutorial
DOC: further changes in fftpack tutorial
enhanced one example
Fixed issue #2720 in tutorial
DOC: remove an obsolete file
ENH sparse:  Add support for sparse matrix .min and .max axis arguments.
TST sparse: Tests for sparse matirx min and max axis args.
adressed review comments, used [] throughout the document
BLD: fix Bento build also on OS X.
DOC: fix list of minimization methods supporting Jacobian
BUG: count function evaluations in approximate Jacobian for L-BFGS-B

Closes #2305.
TST: stats: Added a regression test for stats.wilcoxon.  Closes gh-2391.
DOC: additional notes about FFTs, typo fixes, etc.
MAINT: Use boolean defaults for boolean parameter overwrite_x
MAINT: Use boolean defaults for boolean overwrite_x parameter
DOC: Add simple ifft Returns section