Add loading indicator for jobs list
Add loading indicator for jobs list

This also fixes an occasional bug which occurs when jobs list is being
displayed, but job data is not loaded yet and links are not rendering
properly.

fotinakis/travis-web,mjlambert/travis-web,2947721120/travis-web,Tiger66639/travis-web,mjlambert/travis-web,fotinakis/travis-web,Tiger66639/travis-web,2947721120/travis-web,fauxton/travis-web,travis-ci/travis-web,jlrigau/travis-web,mjlambert/travis-web,travis-ci/travis-web,2947721120/travis-web,jlrigau/travis-web,fotinakis/travis-web,jlrigau/travis-web,fauxton/travis-web,fauxton/travis-web,Tiger66639/travis-web,Tiger66639/travis-web,mjlambert/travis-web,2947721120/travis-web,fauxton/travis-web,jlrigau/travis-web,travis-ci/travis-web,fotinakis/travis-web,travis-ci/travis-web