Making it possible to sort the Results-table under Overview.

You can select one or two players.
If you select one player, all matches that the selected player has played will be showed.
If you select two players, all matches that the two selected players has been played against each others will be showed.
Moved the javascripts from the overview template to a separate javascript file.

And added the parameter @extraHeader to main.scala.html.

Now the signature looks like the following:
@main("menuItemName") { // Extra header code } {
    // Body
}

This line '@main("menuItemName") { // Extra header code } {' needs to be on ONE row.
Merge pull request #7 from brange/filterResults

Making it possible to sort the Results-table under Overview.