Merge pull request #21 from wtsi-npg/devel

pull from wtsi devel to my devel (release 74.14)
authentication through npg own enogmatic.cgi residing relative to where the request comes from; straightforward return in st::api::lims::_sample_description
updated expected result for a live reference retrieval test following a change in the reference genome study field
Merge branch 'devel' of github.com:wtsi-npg/npg_tracking into devel
Merge branch 'devel' of github.com:wtsi-npg/npg_tracking into devel
Merge remote branch 'mg8-remote/devel' into devel

Conflicts:
	Changes