Added option for 2 possible layouts of the idpdisco. The current link-list and the new dropdown box. Layout is choosen in the config.php.

Added cookie support for prefered choice of idp.

My 1st commit to simpleSAMLphp



git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@161 44740490-163a-0410-bde0-09ae8108e29a