Wicegrid

I added the wicegrid gem. Using wicegrid, I restructured the master inventory table and added some basic features. With this pull request, users are able to search for items by name using the first row. In addition, the table highlights all items with inventory levels that are lower than the par level. 

Lastly, I reorganized and elaborate upon user stories. I realized that to keep track of active inventory, we actually need two tables: one for evaluating whether items are meeting PAR levels, and one for keeping track of check-out items.