Possible fix for DB issues with PHPixie

When writing the phpixie database config file I used Silex as a reference. It used "tfbdata" as the database host. The default php benchmark implementation (only one that worked) used "locahost".

So I'm switching phpixie config file also to "localhost" database. If this fixes the problem, than perhaps other php implementations should also use that setup.
Merge pull request #533 from dracony/patch-1

Possible fix for DB issues with PHPixie