BLD Release 1.2

It has been 6 months since last release (except bugfix release 1.1.1)
and several minor improvements have accumulated.

Full ChangeLog:

    * Export locmax|locmin at the mahotas namespace level
    * Break away ellipse_axes from eccentricity code as it can be useful on
    its own
    * Add find() function
    * Add mean_filter() function
    * Fix cwatershed() overflow possibility
    * Make labeled functions more flexible in accepting more types
    * Fix crash in close_holes() with nD images (for n > 2)
    * Remove matplotlibwrap
    * Use standard setuptools for building (instead of numpy.distutils)
    * Add overlay() function