LocalSliceStore: comment typo
DjangoUtils: function to return a rect representing the bounding box over a Segment. I feel like this function might already exist...
DjangoSliceStore: getHash(Slice) is now public
DjangoSliceStore: option to force fetching Slices from the server, even we already cached them. This is intended to be used for testing, to ensure that JSON->Slice decoding works properly
DjangoSegmentStore: fleshing this out. WIP