Clean up mission_control_get_hostname

Move the check for FQDN into the method itself.
Use ip_address() for reverse proxy suport
Add table headers to the SQL breakdown
Refactor queue and batch getters to be reusable
Add time_ago helper for formatting relative dates
Prevent site styles from overriding mission control
Allow batch to be hovered
Bump to 7.x-1.4
Merge pull request #14 from jacobbednarz/update-batch-overview

Allow batch data to be available with a hover