Remove "interactivity" for UTF grid requests as it's now handled by tile server

Also move createPlotUTFLayer() closer to its friends
Merge pull request #110 from RickMohr/remove-interactivity

Remove "interactivity" for UTF grid requests (now handled by tile server)
Add management command to import otm1 data
Merge pull request #94 from steventlamb/topic/more_dev_data

Add management command to import otm1 data