Items page should show current inventory totals, broken down by storage location

[armahillo]

When I visit /items/X, it shows the data about the item with id X, but it does not show the current holdings total. I think that it should.

Also the /items route should display a "total held" column for each item.

I can probably get this one but if someone else is bored and wants to, feel free!

[mcshakes]

@armahillo Definitely bored and looking to help if this is still needed

[seanmarcia]

Hey @mcshakes this is the project we delivered to our stakeholder last year. Due to demands from other diaper banks we're turning what we build them in to a multi-tenant application. We'd love help and PRs on it! You can find the project at: https://github.com/rubyforgood/diaper

[seanmarcia]

@mcshakes You should join us in slack, grab and invite at rubyforgood.herokuapp.com, and then find us in the #diaper channel!