Add localtest.sh to test ipynbs
Add localtest.sh to test ipynbs

This tests more than Travis does: the purpose of this test is to ensure that
our documentation notebooks are up to date.

openpathsampling/openpathsampling,dwhswenson/openpathsampling,dwhswenson/openpathsampling,jhprinz/openpathsampling,dwhswenson/openpathsampling,openpathsampling/openpathsampling,openpathsampling/openpathsampling,choderalab/openpathsampling,openpathsampling/openpathsampling,jhprinz/openpathsampling,choderalab/openpathsampling,dwhswenson/openpathsampling,choderalab/openpathsampling,jhprinz/openpathsampling