Updated a lib; Added an information message to the cockpit editor and the cockpit about the development stage

Cleaned up a lot of code; Modified the visual appearance of the GUI itself; Removed bugs; Added some localization strings; Updated the flow editor; replaced the checkstyle config file with the newer one from the Kieker project; Removed a lot of unnecessary comments to make the code easier to read

Corrected the user management; Solved a minor issue with the growl component and dialogs; Continued with cockpit editor and cockpit

This reverts commit 8fd2a615.

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