Exchange other than topic can be created
add specs
Bump version to 2.3
Merge pull request #188 from llh1/52285563_ability_to_use_a_direct_exchange

52285563 ability to use a direct exchange
Merge 'sanger/master' 2.3.0 into development

Conflicts:
	Gemfile.lock
	lib/lims-core/version.rb