Responsive table headers

Ensure that the .responsive-table headers do not act like the .responsive headers. If you look at:

http://dev-earthquake.cr.usgs.gov/earthquakes/eventpage/usp000qjau#scientific_tensor

If you collapse the window size down to mobile viewport size you will see the thead > tr > th elements lose their padding and background color. I also updated the tbody > tr > th elements to have the same text shadow as all other th headers.