Don't track coverage on jruby
Don't track coverage on jruby

I think this is the reason for long standing jurby hangs. We don't have
specific code paths on jruby, so it seems unnecessary anyways.

activeadmin/activeadmin,deivid-rodriguez/activeadmin,javierjulio/activeadmin,deivid-rodriguez/activeadmin,deivid-rodriguez/activeadmin,activeadmin/activeadmin,activeadmin/activeadmin,javierjulio/activeadmin,javierjulio/activeadmin