Simplified the Taxon Concept -> Suspension relationship by removing the
TaxonConceptSuspension relation
Removed TaxonConceptSuspension migration
Removed traces of TaxonConceptSuspension model
Refactored TaxonConceptSuspension controller spec inline with design
changes
Merge branch 'cites_quotas_and_suspensions' into eu_opinions_and_decisions

* cites_quotas_and_suspensions:
  Refactored TaxonConceptSuspension controller spec inline with design changes
  Removed traces of TaxonConceptSuspension model
  Removed TaxonConceptSuspension migration
  Simplified the Taxon Concept -> Suspension relationship by removing the TaxonConceptSuspension relation

Conflicts:
	app/models/taxon_concept.rb
	config/routes.rb
Updated EU Decision model spec to include restriction validations