GOMC build_NVT_pore_*-layer.py has a syntax error

[justinGilmer]

Hey @bc118,

I was working through the SI and running some of these simulations. However, all the files i described in the issue title will have syntax import errors happen before anything is able to run.

This is due to this line for example

from mbuild.recipes.porebuilder import GraphenePore

That incantation does not work for the recipes section due to the plugin architecture.

To find all locations of these from the terminal:

(assuming you are at the top level of the mosdef_slitpore repo)
grep -inR "from mbuild.recipes.porebuilder"

will discover all files where this occurs, and the line number for each file.
Note that this grep command was the GNU Grep that ships with linux and not the BSD Grep that ships with MacOS. The flags might be slightly different.