MAINT: signal: clean up some C code to eliminate a few compiler warnings
Added test for the truncnorm.ppf and truncnorm.isf
Fix for ticket #1131: ppf and isf for Lognormal fails on array-like 'loc' or 'scale'
Clarified the meaning of self.a*scale + loc and self.b*scale + loc
Merge branch 'pull-463-ppf-isf' into master.

Reviewed at https://github.com/scipy/scipy/pull/463
MAINT: some cleanups in stats.distribution tests.
MAINT: use the new special.xlogy function in stats.entropy

Reviewed as https://github.com/scipy/scipy/pull/479
TST: add test for special.xlogy usage in stats.entropy.

Also silence a warning printed by another test in test_distributions.
Merge pull request #485 from WarrenWeckesser/sig-gcc-warnings

MAINT: signal: clean up some C code to eliminate a few compiler warnings
DOC: add examples and more detail to optimize.brute docstring.

Reviewed as PR-364.
BUG: handle matrix objects as initial guess in MINPACK (ticket #1770)
BUG: handle matrix objects as initial guess for TNC