allow interrupt action to be a no-op
put docstrings in base _allow_interrupt

allows autodoc to find it on Non-Windows
remove numpydoc extension

just install the package
py3 fix in apigen
add utils.win32 to docs
what's new for 14.4.0
don't assign allow_interrupt.__doc__

set it in class definition,
because assignment isn't allowed on py2
Merge pull request #598 from minrk/whatsnew

changelog for 14.4.0