Added MEDIA_URL setting.
Moved species to Experiment and added Researcher fields.
Some adjustments to models.  Moved species field to Experiment.
Added dev server publication of media files (during development only).
Added image upload and experiment URLs.
Added some experiment templates.
Added "experiments" link to sidebar.
More migrations.  Subject to replacement until deployment.
Removed tokenizer reference.
Extremely simple test capture page.

Every time you hit the button, another image is added to xp_id 1.
First commit of raspberry pi imagery server for FishFace2.

Adapted from imagery server of FishFace.
Added some experiment views and raspi-related views.
Rearranged.  Added URLs for experiments and raspi stuff.
Implemented deleting files from storage when corresponding db object deleted.
Added is_cal_image field to admin interface for Images.
Added django and numpy to project requirements.