Bump version 0.1.0-pre -> 0.1.0
Add plugins directory and hgrid-draggable

from https://github.com/CenterForOpenScience/hgrid-draggable
Add registerPlugin method
Build
Bump version 0.1.1
Build
Remove stale plugins directory
Add back hgrid-draggable
Take 2
Add back hgrid-draggable