Update to bootstrap 0.12.0 to fix tooltips

See: https://github.com/angular-ui/bootstrap/issues/2828
Alternatives to upgrading were:
  - Add hack tooltip directive that adds the trigger/placement attrs
    to each tooltip
  - Manually add trigger/placement attrs to each tooltip in the src

Update had breaking change where dropdowns require the
dropdown and dropdown-toggle attributes, not just the classes.
Should have been this way anyway, so the attributes were added to each
dropdown.
Merge pull request #554 from WorldBank-Transport/feature/fix-tooltips

Update to bootstrap 0.12.0 to fix tooltips