first pass at measurements add form... needs a lot of work!
added reqs for forms
some formy bits, to add rows to a submission #2
added Test and TestValue through which Measurements record their values. #2
Convert load_gqahi_nutrients script to management command
changed load gqahi to work with new models, added note on add form #2
Minor refactoring of filter code + conncted to map

Filter is now passed into the map page context & renders a form we use
for updating the map. The 'observed' field basically checks the key in
the hstore 'observations' field, so based on the bootstrap data, valid
lookups are 'Nitrates', and 'Orthophosphates'. Dates should be
YYYY-MM-DD, but really we need to hook up some kind of calendar widget
here.
use proper named URL
properly report results count
tweaked the way counts are reported
Merge pull request #27 from jimr/map-filter

Map filtering
Merge pull request #28 from jimr/master

allow local settings to update things like INSTALLED_APPS
Merge branch 'master' into add-obs-basics

Conflicts:
	observations/views.py
changed parameter filter, attempt at widget on date filters - TODO: Fixme!
tweaked widget to have min view and included media
change req for django-datetime-widget to stringfellow fork
Merge branch 'add-obs-basics'