added dropdown button links
added dropdown button links pointing to tabbed content
refactored html.erb files
can add multiple musicians to cd create form
can add multiple ensembles via cd create form
cann add multiple authors via create book form
can add multiple actors via create dvd form
can edit multiple musicians via edit cd form
can edit multiple ensembles via edit cd form
can edit multiple authors via edit book form
can edit multiple actors via edit dvd form