Changing product space node size scale

When size encodes world trade
Added and styled submit button for product and country forms.
Working on making the Go button work, still buggy.
Added the Standard Bank Group to supporters.
Fixed typo.
Leftover work on go btns that I forgot to save.
Get phantomjs temp dir from settings.
Submit buttons for country and product dropdowns now works.
Merge branch 'beta' of https://github.com/cid-harvard/atlas-economic-complexity into beta
Minifying js again, changing second example image.
Deleting all those off tracked images from master.
Pin django-redis version to 3.7.2 for now because of raw_client bug
Make static image optional.
Merge branch 'beta' into marcela_japan_2013