Add support for Fortify auth tokens

Auth tokens must have AnalysisDownloadPermission - otherwise 'Access
Denied' is generated.

These tokens can be generated as follows:

PS C:\Program Files\Fortify Software\HP Fortify v3.60 Demonstration
Suite\Tools\fortifyclient\bin> .\fortifyclient.bat -url
http://127.0.0.1:8180/ssc -user XXXX -password XXXXX token -gettoken
AnalysisDownloadToken