RFR JDK-8066867: Add InputStream transferTo to transfer content to an OutputStream

[Pavel Rappo]

Hi everyone,

Could you please review my change for JDK-8066867?

http://cr.openjdk.java.net/~prappo/8066867/webrev.00/

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The task originated from discussion:
  http://mail.openjdk.java.net/pipermail/core-libs-dev/2014-November/029650.html