Fixes #7939/BZ1148488: increase prominence of nutupane loading display.

The nutupane-details loading indicator was small and not noticeable.  This
commit increases the prominence of the loading indicator.

http://projects.theforeman.org/issues/7939
https://bugzilla.redhat.com/show_bug.cgi?id=1148488
Merge pull request #16 from waldenraines/7939

Fixes #7939/BZ1148488: increase prominence of nutupane loading display.