gAudit - fix a few access control and XSS vulnerabilities

https://github.com/cloudspokes/google-gAudit��

Address the following:

1. The POST action implemented in ProcessorServlet (line 390 shown of the master branch) checks if a user's session has timed out, but doesn't redirect to the login page if the user isn't logged in at all (doesn't handle ELSE��condition)
2. The web.xml security-constraint element doesn't contain the auth-constraint/role-name elements, which are needed to restrict access to the application from unauthenticated users.
3. Address all the following XSS issues by properly escaping values before adding to the DOM:

FIlename, line number, code snippet (line number may be off slightly, so look for the snippet)

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