Use chosenjs for selecting and creating tags

Remove “remove_unused_tags” due to transaction issues with
Post.tag_list=(names_or_ids)
Update version
Prevent and handle empty/blank tags
Merge branch 'master' of https://github.com/FlyoverWorks/storytime into chosen_tags

Conflicts:
	lib/storytime/version.rb
Merge pull request #27 from FlyoverWorks/chosen_tags

Chosen tags