HR fix for 236293 - "old version of HTML file deployed"

 > "old version of HTML file deployed"
 > https://netbeans.org/bugzilla/show_bug.cgi?id=236293

When two projects with same Web Root are deployed then internal web 
server will server files from the second project regardless of 
consequent deployments and user cannot deploy the first project anymore. 
The fix makes sure that any consequent deployments override previous 
project deployed under the same Web Root. The fix is safe and tested by 
few new unit tests added. Tomas has not reviewed it yet though.

http://hg.netbeans.org/web-main/rev/9572d406d81b

Thanks,
-David