updated Gemfile.lock

cf. 63ab6026f50e6de64852089930ba615cc405cae1
fixed HTML closing tag
added pry-remote
restrict request formats for concepts#index
fixed unique pref label validation

exclude published versions from validation, fixes #164
ditched document and controller arguments in build_rdf_subject

fixes #180
Revert "removed mysql index tweaks from importer"

This reverts commit 18793583e3141ecfc57cbefdcbdcc0fc0ebf408f.
removed mysql hacks, added hook methods to importer
require skos_importer globally
Merge branch 'master' of github.com:innoq/iqvoc into fix_collections
Never show empty labels in entity select data