Repair null pointer exception when forwardedUser is null.  This occured when
upgrading from a previous version, http://i.imgur.com/WzfWeVX.jpg.
Merge pull request #17 from pmotyka/master

I will merge this pull request, didn't get the idea that you were trying to use only the LDAP instead of passing the username in the header. If the forwardedUser (which represents the name of the field to have the info retrieved from) is not informed in the configuration, then you do not need reverse proxy. Do you follow me on that one?

In the next release I will change the line 486m it's a really bad practice to do assignments inside an IF statement