gAudit: Merge CSRF and XSS prevention from one submission to another

1) Port the ��CSRF prevention code (csrf token validation) from either guarav23 or vishesh91 branches INTO the MASTER branch

2) Fix at least one DOM-based XSS vulnerability in header.jsp (~lines 109-123). ��Ideally you'd clean this up a bit too, since the retrieval of the parameters seems clunky in general.

make clean commits that are easy to understand (no major reformatting, etc)