Volunteer Portal - Claim a time window

[dherbst]

Feature Description

A volunteer can pick a time window to cover from #112 and will take them to this page to specify if they are going to cover the window and how many hours they will cover.

Expected solution

A volunteer can sign up to cover a window that needs to be covered.
The volunteer can specify the start time and the number of hours they will cover. They do not necessarily have to cover the entire window, but if they do, then that window is considered covered.

From the calendar page:

The volunteer will click on the red uncovered time window and open the claim page for that entry. The page will have on it:

• Date and window start time - end time
• Location for the window
• Start Time drop down initialized to the window start time
• End time drop down initialized to the window end time
• A volunteer button which marks the window as claimed

If the window is fully claimed, the window status changes from "open" to "covered"
If the window is partially claimed, the window status changes from "open" to "partial"

Testing

[dherbst]

Time windows can be claimed and cancelled now.