Update bookie github links
Remove unnecessary dependency on logilab-{astng,common}.
Remove unnecessary dependency on ropemode and ropevim.
Make dependency on raven optional.
Merge pull request #396 from jelmer/remove-unnecessary-reqs

Remove some unnecessary requirements.
Remove unnecessary dependency on logilab-{astng,common}.
Remove unnecessary dependency on ropemode and ropevim.
Make dependency on raven optional.
Merge branch 'develop' of https://github.com/bookieio/Bookie into develop
Merge pull request #391 from suryatech/fixLinks

Update bookie github links in the docs.
Merge branch 'develop' of https://github.com/bookieio/Bookie into develop
Test added