Revert "#68 add multi server logout() capabilities."
Revert "#68 add multi server logout() capabilities."

This reverts commit 550c0eb0be607ee72b1c0fd568c5e71ce66d6f9a.

yangchunyong/phpCAS,mickelfeng/phpCAS,neopeak/phpCAS,rakesh-mohanta/phpCAS,snelg/phpCAS,chand3040/phpCAS,fh/phpCAS,Jasig/phpCAS