Add sonyxperiadev/pygerrit to pullreq-perf projects

I am the maintainer of pygerrit; I would be interested in seeing
the stats for this project.

Change-Id: I9ad406b53d5df9c966238fb347d800ed6687881c
Add facebook/buck to pullreq-perf projects list

As a recent contributor to this project I am interested in seeing
the stats.

Change-Id: Ieb705f000780e23e34df2c24c66e52f24fb43f94
Merge pull request #14 from dpursehouse/add-some-more-projects-to-pullreq-perf

Add some more projects to pullreq-perf