message: add tooltip to roster item
diff: <div class="jsxc-avatar jsxc-shrink--no"></div>
  <div class="jsxc-bar__caption jsxc-grow">
  - <div class="jsxc-bar__caption__primary">{{name}}</div>
  - <div class="jsxc-bar__caption__secondary">{{lastMessage}}</div>
  + <div title="{{name}}" class="jsxc-bar__caption__primary">{{name}}</div>
  + <div title="{{lastMessage}}" class="jsxc-bar__caption__secondary">{{lastMessage}}</div>
  </div>
  {{#> menu classes="jsxc-bar__action-entry jsxc-menu--drop-top-right jsxc-menu--light" button-classes="jsxc-icon jsxc-icon--more-dark jsxc-icon--clickable"}}
  