renamed _menu.hbs to tabbed-menu.hbs

added Bootstrap tab markup to tabbed-menu.hbs

in superheroes.hbs now invoke tabbed-menu.hbs via a view rather than as a partial

new tabbe-menu view which activates tabs after the template is inserted
Merge pull request #35 from trianglegrrl/tabbed-team-attributes

Moved Team and Caliper Attributes lists into tabs