SEC-2137: Allow disabling session fixation and enable concurrency control
SEC-2194: Remove login page from hellomvc and insecuremvc
SEC-2251: Polish Hello World guides

* Correct how to add username and logout to mvc
* Externalize :revnumber:
SEC-2194: Update samples to have jsp-api
SEC-2194: Add margin to links in header of samples
SEC-2194: Remove samples errors/tabs folders
SEC-2194: hello samples displays username and logout properly
SEC-2194: Remove unnecessary MessageSecurityWebApplicationInitializer from helloworld
SEC-2221: Fix the ignored media types to use includes instead of equals
SEC-2135: Support HttpServletRequest#changeSessionId()
SEC-2135: Document HttpServletRequest.changeSessionId() support
SEC-1574: Add CSRF Support