This reverts commit 38c04dbd.

Made sure that the downloaded kieker jar will be copied to the classes directory during compiling (the redundant jar file is unnecessary now).

Added the JSF taglib for Spring Security; Removed the login-"logic" from the UserBean and moved it to the Spring Framework; Started with the usage of templates for the existing pages; Started with the page for the user management; Added more security patters; Added another user for test purposes

Started with an improved version of the GUI, including a multi user mode; Updated also the Kieker-jar.