Refactor and add support for POST of region as well.
Tests for region POST. Work still needed.
Fix test data for region POST
Final fixes to unit testing, additional warning messages.
Merge branch 'feature/POSTsequence', to add support for region POSTs.

Conflicts:
	lib/EnsEMBL/REST/Controller/Lookup.pm
	lib/EnsEMBL/REST/Role/PostLimiter.pm