File _service of Package boost

<services>
	<service name="download_url">
	    <param name="host">downloads.sourceforge.net</param>
	    <param name="path">/project/boost/boost/1.64.0/boost_1_64_0.tar.gz</param>
	</service>
	<service name="verify_file">
		<param name="file">_service:download_url:boost_1_64_0.tar.gz</param>
	   	<param name="verifier">md5</param>
	   	<param name="checksum">319c6ffbbeccc366f14bb68767a6db79</param>
	</service>
</services>