def wagonfile_remove(specs)
      wagonfile_edit(specs) do |spec, content|
        content.sub(gem_declaration_regexp(spec.name), '')
      end
    end
def wagonfile_remove(specs)
      wagonfile_edit(specs) do |spec, content|
        content.sub(gem_declaration_regexp(spec.name), '')
      end
    end
Remove the given gem specifications from the Wagonfile.