Simplify multi-project support

[ysb33r]

This example by @galmor shows the pain that one has to go through in 0.5 to load in dependencies from every subproject.

In the end of day the following code needs to be rolled-up into the plugin

ext {
  thisProject = project.name
  addConfigurationsFor = { Project forProj ->
    if( forProj != project ) {
      forProj.configurations.each { Configuration c->
        logger.info "${forProj.name}: ${c.name}"
        String configName = "${forProj.name}_${c.name}_deps"
        project.configurations.create configName
        project.syncRemoteRepositories.configurations configName
        c.dependencies.each { Dependency d ->
          if (!(d instanceof ProjectDependency)) {
            logger.info "Found ${d} in ${forProj.name}. Adding to ${configName}"
            project.dependencies.add configName, d
          }
        }
      }
      forProj.childProjects.each { String projName, Project p ->
        addConfigurationsFor(p)
      }
    }
  }
}

addConfigurationsFor(rootProject)

• [x] Add method that will roll up all external module dependencies for all other subprojects
• [x] Add method that will roll up all external module dependenices for on subproject
• [x] Provide docs that describe a good practice for multi-project builds.

[ysb33r]

Released as part of 0.6