new task dependencyHomepageInfo and filtering by regexp

[skoky]

I have extended the plugin to list dependencies homepage info. We are using this to report changes in the project with respective changes listed on module's homepage. There is also a filter used to list only some dependencies. This could be maybe use for all tasks, but in this pull request it is for the new task only

[jrudolph]

Thanks for the suggestion, @skoky. I think both kinds of functionality would be nice additions to sbt-dependency-graph. I'd favor splitting it up into two changes / PRs.

I'd like the filtering functionality to be applicable for everything, couldn't we reuse sbt.DependencyFilter or sbt.ExclusionRule?

[skoky]

Yes, great. Fill free to split this. Filtering seem to be more logical for me but exclusion would work as well