Add sns_share setting
Merge branch 'master' of github.com:zomeki/zomeki-development into apply_sns_share_to_gp_article

Conflicts:
	app/models/gp_article/content/doc.rb
	app/views/gp_article/admin/content/settings/_form.html.erb
Add sns_share to doc editing page
Add posting to facebook
Fix sns logout
Fix no method error while layout rendering
Apply sns share to gp_article doc
Merge branch 'master' of github.com:zomeki/zomeki-development

Conflicts:
	db/schema.rb