Add production database config
Prevent full load of every taxon in search form

Improvement for #15
Prevent cascade of all more-specific taxa pickers

Goes a long way in search form performance - for #15
Add scopes for parent/child taxa
Add scope for in_iczn_group
Simplify fetch of child taxa when changing parent

Only send the changed taxon as the parent, not the other parents.
Remove unused method

taxa_in_iczn_group_with_parents recursively collected project taxa and
was replaced with the simpler taxa_in_iczn_group_with_parent

Improves performance for #115
Merge pull request #129 from NESCent/search_form_performance

Search form performance