Add showRedundant flag.

[hgschmie]

To illustrate the actual code dependencies in a project (especially when
enforcing total dependency definition using e.g. the dependency plugin),
it is necessary to have all edges from projects to dependencies present.

Currently, in a dependency tree like this:

            A
           / \
          B   C
         /
        C

the graph plugin will only plot

           A
           |
           B
           |
           C

This pull request adds a flag that will not remove any "redundant"
edges, so the result will be

           A
          / \
         B   |
          \ /
           C

While these graphs are more cluttered, they are also very useful to
fully grok dependencies in large Maven projects.

[buildhive]

Jeff Caddel » graph-maven-plugin #3 SUCCESS
This pull request looks good
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