Add a Graphite Reader and a fake Finder.
Add a Graphite Reader and a fake Finder.

There are no tests yet, but I wanted to get this out so as to help
sync'ing with the ongoing work on writing a real Finder.

iksaif/biggraphite,iksaif/biggraphite,iksaif/biggraphite,criteo/biggraphite,Thib17/biggraphite,dpanth3r/biggraphite,Thib17/biggraphite,unbrice/biggraphite,Thib17/biggraphite,criteo/biggraphite,criteo/biggraphite,Thib17/biggraphite,iksaif/biggraphite,criteo/biggraphite,natbraun/biggraphite