Added localStorage so save REST Services URL

- save unique URLs to local storage as string array
- next step to load stored URLs to tree on page load
Merged local with upstream

- conflict resolved in shepherd.js
Completed saving URLs to local storage

- This closes #44
- Set local storage with unique URLs
- Retrieve URLs on page load to populate tree to set user where they
left off
- Removed prompt warning user navigating away from page
- Enter key clicks browse
Working on jsTree events for node hovering

- hover_node and de_hover events
- fixed typo in "About"
Resolved conflicts
Merge branch 'pr/50'

* pr/50:
  Working on jsTree events for node hovering
  Completed saving URLs to local storage
  Added localStorage so save REST Services URL