Show the release versions dropdown even if there's only a single release

Otherwise it's an empty dropdown, which is confusing and looks weird.
While we could hide the dropdown toggle (caret) altogether when there is
only a single release, always show it for consistency across all
distributions.
Move the favorite button back into the breadcrumbs next to the release

Effectively re-applies 77e99e3 on the new bootstrap layout.  Positioning
of the version dropdown caret is adjusted slightly (and made relative to
font-size) to accommodate proximity to the favorite button.
Move the release versions dropdown to the left side of the breadcrumb

Nicely de-clutters the right side of the release breadcrumb now that
the favorite button is there.

This also causes the options list itself to appear directly underneath
the breadcrumb instead of awkwardly to the right.  The net result is
that it actually appears more like a cohesive dropdown.
Make sure each dependency link has a width and isn't cut off unreasonably early

Previously these were displayed inline (due to 851a6fc), and inline
elements don't have a width.  Set zero padding and margin and take up
the whole width of the container instead.
Merge branch 'trs/bootstrap-nits' into mo/bootstrap