refactor metadata/configuration stuff so it can be splitted out into files...

refactor metadata/configuration stuff so it can be splitted out into files (aselect-sp-hosted,aselect-idp-remote etc.)

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@248 44740490-163a-0410-bde0-09ae8108e29a