Better UI for viewing gists

 * Add a title to Gist
   * Update search data to have gist titles
   * Add specs for gist titles
 * Add default title and matching regex with public interfaces to Gist
 * Add upgrade:gists_by_setting_titles to set titles for all gists
 * Refactor MyGists::Refresh to fetch and save a gist title
 * Refactor GistDecorator
   * Remove public and github icons from #icons
   * Add #title which links gist back to GitHub
   * #description wrapped in a p tag
 * Views now list gists as an unordered list
   * Refactor styles to match new markup
 * Use an unordered list to render secret and starred gist on help page
 * Add .tag class which extends Bootstrap .text-success
   * All tags look the same throughout the entire site
 * Update README
 * Update LICENSE