Merge pull request #42 from kobe1024/master

Trivial fix of psycopg2 requirement version
First implementation of GF profiling files collector.

If profiling is enabled.
Renamed extra/profile.sh in extra/profiling.sh
Added staging requirements file

This change is necessary in order to provide a more complete dev/stag/prod classification for automation deploying.
Although in this specific case we have two identical files (stag.txt and prod.txt), this may change in the future.