merged migrations
Merge branch 'master' into add_taxonomies_table
added taxonomy model
added taxonomy_id to designations
added taxonomy_id to designations
added taxonomies management page
amended designations manager to include taxonomy
Merge branch 'add_taxonomies_table' of github.com:unepwcmc/SAPI into add_taxonomies_table

Conflicts:
	app/models/designation.rb
	app/models/taxonomy.rb
	db/seeds.rb
changed references to designations into references to taxonomies in sql scripts
removed references to designations from application code
renamed wildlife_trade to cites_eu
changed name of taxonomy field in the taxon_concepts_view
fixed the import scripts and added some more specs
kind of fixed listing changes controller: preloads dropdowns with change types and species listings applicable to all designations within a taxonomy. might be an idea to change this.
Merge branch 'add_taxonomies_table' into listing_changes_form

Conflicts:
	app/controllers/admin/listing_changes_controller.rb
	app/models/listing_change.rb
added nested route for taxon_concept / designation / listing changes (create does not work)