Passing the umbrella target to settings_post_process

[marcelofabri]

Fixes #8

plugin 'cocoapods-acknowledgements', :settings_bundle => true , :settings_post_process => Proc.new { |settings_plist_path, umbrella_target|
  puts "ACK"
  puts settings_plist_path
  puts target
  puts target.cocoapods_target_label
}

This breaks the previous settings_post_process interface, but as the plugin is not yet released IMO it's not an issue.

[orta]

:dancers: