Visualize a Haskell project's dependency graph using Graphviz dot.

With stackage-build, multiple packages can't be grouped into a project using the stackage-build.config file. stackage-dot shows the dependency graph between each package listed in stackage-build.config. If stackage-cli is installed, then usage is as follows:

$ cd /path/to/project
$ stackage dot > graph.dot
$ dot -Tpng < graph.dot > graph.png