Fix character values on Remaining Non-Monocots species pages.

This bit of temporary code fixes the page for now while the big
Remaining Non-Monocots pile still holds all the character values. (#374)
Removed old placeholder models for user groups.
Add Pod and PodMembership models.
Fix migration merge issues.

Create a new migration on top of merged-in migrations for plantshare.
Switch the foreign key for Pods to UserProfile instead of User, so we
can add convenience functions for retrieving Pods.
Add checklist models.
Add item fields and sharing fields.
Add methods for common checklist / sharing scenarios.
Merge branch 'feature/checklists'
Correct Sightings API to return only approved photos. (#292)
Merge branch 'master' of github.com:newfs/gobotany-app
Add admin user to PartnerSite record upon database rebuild. (#375)
Add a temporary page for Level 3 smartphone user test links. (#308)
Merge pull request #380 from jazkarta/master

Get list of states from settings
Add command to nightly email subject-line #352
Make it possible to display filter choices inline on small screens.

Each time a filter question is selected, attach the working area
immediately after it. (#308)
Merge branch '308-smartphone-filter'
Refactor and simplify checklist models.

After a discussion with John I came to the conclusion that the model
design for the checklist feature was a bit too complex to start with,
and we could cover most of the use cases with this simpler model. It
should be fairly straightforward to add any additional required
functionality later.
Merge branch 'feature/checklists'
Improve layout of Level 3 working-area choices.

Position the radio button so it is always next to the choice
text. Vertically align all choice text, so choices without
drawings no longer appear higher than those with drawings.
Limit the width of very long choices when only few appear.
Detect whether any drawings occur in a filter or not. (#308)
Fix selecting a choice by clicking a drawing.

With the revision of the choices layout, drawings no longer
automatically selected their choice item when clicked. (#308)