Minor visual tweaks to combatants.

* Added a 2px border to combatants. This makes combatants with images look really nice.
* Shrunk the selected border by 2px. Improves selection on combatants with images.
Auto collapse the page header.

We now auto-collapse the page header, since when using a map, you almost
never need it. However, to give people a chance to notice that it's
there, we leave it shown for a second before collapsing. (Plus, it looks
better.)
fixed combatant auras.
Merge pull request #45 from lordnull/combatant-visual-tweaks

Minor visual tweaks to combatants.