Move @font-face declarations into common CSS file

Including the Google stylesheets requires additional HTTP requests to
first request the stylesheet and then request the fonts themselves.

The @font-face declarations were copied from the stylesheets in the
links.
Remove unreferenced 'tron.css' stylesheet
Remove unused 900 weight Lato font face

Lato is used in 100- and 300 weight but never in 900. Remove the
@font-face declaration to prevent clumsier browsers from downloading
an unneeded font.
Use spec syntax for keyframe animations, fix Firefox

All keyframe animations were only defined with the Webkit prefix
"-webkit", which is not understood by Firefox. Define the animations
with the standard syntax to fix this.

This makes the web UI appear properly in Firefox 23.
Nuke styles duplicated from Bootstrap

Bootstrap removes margin and padding from most elements in its
reset.css. The margin/padding removed here was duplicate styles.
Merge pull request #44 from mesosphere/assets

Clean up CSS, make the UI appear in Firefox