Upgrading numpy version (#278)

* ENH: upgrade numpy

* DOC: updating numpy docstring

* ENH: upgrading version number

* BLD: setting matplotlib backend to agg

* trimming down ci requirements

* adding back in flake8 and pep8

* adding pip back in

* DOC: raw strings

* flake8

* looks like bokeh flipped the ordering.  weird

* matplotlib tick labels swapped

* py36

* flake8

* forgot import