add biocViews to DESCRIPTION to enable install of graph from bioconductor (ref #30).

[annakrystalli]

Hi,

We've recently had a package submitted for rOpenSci review, Rclean, that depends on this package. Unfortunately, the graph dependency, identified as an issue in #30 is causing problems as review requires that packages can be fully installed from source code using devtools::install() (unless they have some System dependencies whose install can't be automated).

I've added biocViews: to the DESCRIPTION file, as suggested in this comment and by changing the remote repository pointer in Rclean to install my fork of CodeDepends, installation of all dependencies, including graph succeeds.

This setup installs version 1.62 of graph which I believe is the latest version?

Hope this helps.