ken/dan: add acts_as_taggable gem
dan/ken: add migration for acts_as_taggable
* creates two tables: tags and taggings
ken/dan: add acts_as_taggable to Source model
* made tag_list attr_accessible
dan/ken: add field for tags in sources/new.html.erb
ken/dan: clean up Gemfile – remove pry, move debugger gem to group: development
dan/ken: implement acts_as_taggable.
* guest can add tags when creating a new source
* tags are stored in database
ken/dan: slight refactor, save each tag as individual string
dan/ken: refactor sources#create into single-responsibility methods
dan/ken: fix test in sources_controller_spec
Merge pull request #17 from danbender/acts-as-taggable

Acts as taggable