Removed unused function parameter

This follows from the renaming of the method "html" to "append"
Rationalised some function names

Mainly, removing the use of "contestant", and just using "country"
everywhere.
Align buttons more nicely

Changed the css font size, and wrapped the butons inside a (hidden)
table. For some reason this didn't work properly with just one "year"
button, so I've added a 2013 button with an "unimplemented" alert
message.