Miscellaneous fixes to the CSS stylesheet

There were a couple things that needed to be changed in this file:
    - There was a mixture of tabs and spaces, I've changed it to be all
      spaces.
    - There were no credits at the top of this file.
    - I've added style for the tabs that were not allowing any scrolling
      when the contents exceeded the vertical space available, concretly
      fixing #235.
Add extra padding to some of the divs

The padding had to be added in the form of <br> tags because there's
a problem with the jQuery ui-tabs not scrolling properly.
Add @antgonza to the credits in emperor.css
Merge pull request #237 from ElDeveloper/issue_235

Fixes scrolling not working in some of the UI tabs