Fix link in README.

Forgot to remove debug output.

Update README.

Merge pull request #10 from guilhermearaujo/master

Fix wrong header style.

Fix GraphML output when a formula argument is given.

GraphML requires that all nodes in the graph, including leaf nodes, are defined by a <node> tag. The 'brew deps --installed' or 'brew deps --all' commands already return a separate line for each leaf formula. When a single formula is given, the output only contains a list of  dependencies. In this case, we need to add a line for each leaf node ourselves.

Highlight leaf nodes

- Add highlighting for GraphML
- Introduce command line switch to enable/disable leaf highlighting

Merge pull request #5 from jpalardy/patch-1

Update brew-graph.rb

Update dot example