DOC: remove docstring from UnivariateSpline.__init__

same for InterpolatedUnivariateSpline and LSQUnivariateSpline.
These simply duplicated the class docstrings.
DOC: improve the docstrings of *UnivariateSpline classes

Tweak examples to make plots actually render.
DOC: add a nan masking example to the UnivariateSpline docstring

example is by @juliantaylor,
https://github.com/scipy/scipy/issues/3531#issuecomment-40233093
Exactly one space required before assignments
In dendrogram(): Correct an argument name and a grammar issue.
BUG: misc: Ensure that the 'size' argument of PIL's 'resize' method is a tuple.

In Pillow 2.5.3, the code for the 'resize' function has a statement of the
form 'if self.size == size: ...'.  The expectation is that 'self.size' and
'size' are tuples.  If 'size' is a numpy array, the comparison raises
'ValueError: The truth value of an array with more than one element is
ambiguous.'

This commit ensures that the 'size' argument passed to the 'resize' method
is a tuple.

Closes gh-4032.
MAINT: misc: Remove unused imports and do some PEP8 clean up in pilutil.py.
BUG: expm of integer matrices
TST: strengthen the test for expm of integer matrices
BUG: stats: Refactor argument validation to avoid a unicode issue.

Fixes the handling of a unicode argument to the binned statistics
functions.

Closes gh-4026.
Added newline to documentation for correct display.
ENH: interpolate: Allow splev to accept an n-dimensional array.

Closes gh-4045.
DOC: mention Schoenberg-Whitney conditions in the LSQ*Spline docstring
DOC: use spl(x) in the *Spline docstrings

to avoid confusion between s(x) being the spline function
and s being the (scalar) smoothing parameter
DOC: fix typos in zeros.py.