Added edit fields on traits page for site and treatment.  Fixes
Redmine issue #1881.
Merge branch 'master' of https://github.com/PecanProject/bety
When editing a trait, always keep the existing citation rather that
setting it to the session citation (or more to the point, rather than
erasing it if the session citation is not set).
fix schema css (redmine #2098)
Merge branch 'phenolphtalein-fix_schema_css'
Fixed edit page forms to show the user who created the record rather
than the user who is currently logged in.  Change labels for record
creator and logged in user to clearly show what information is being
displayed.  Made a helper function to display "Unknown" if a record's
user_id column is NULL.
Merge branch 'udaysaraf-sitePage_editUser'
restyle traits/new /edit (label alignment)
Merge branch 'phenolphtalein-restyle_trait'