Revision 168481

Final pass on cleaning up the mojo api...collapsed MavenPluginDescriptor and PluginDescriptor in the same way as MavenMojoDescriptor/MojoDescriptor had been; eliminated the need for plugin.descriptor.Dependency and MavenPluginDependency (using ComponentDependencies instead); adjusted the MojoExtractors (name?) to return Lists instead of Sets; added duplicate checking to a new addMojo(MojoDescriptor) method on PluginDescriptor, so we catch it on all sides; changed the Generators to use execute(outputDirectory, pluginDescriptor) rather than the myriad pluginDescriptor-derived values; added an IT for checking that the build for a plugin will fail if multiple mojos are detected with the same goal; and, added a special case to PluginDescriptor.getGoalPrefixFromArtifactId() to handle maven-plugin-plugin. That should be about it. I'm not sure that I've gotten the IT for that failure test added to svn yet, so that may follow.