WIP: trying to populate Article#keywords
Channel creation generates article objects. Article objects have keywords saved in the database using html meta tags.
bug fix
WIP: comment failing test with error message.
add exception-handling for errors in Article#set_keywords arising from MetaInspector. Change views to reference articles as objects rather than hashes.
Merge branch 'master' into article_caching

Conflicts:
	db/schema.rb
	spec/controllers/channels_controller_spec.rb