RFR: JDK-8200380 String::lines

[Jim Laskey]

String::lines instance method that returns a Stream<String> with elements composed of substrings from the original string delimited by any recognized new line character sequence.

webrev: http://cr.openjdk.java.net/~jlaskey/8200380/webrev/index.html <http://cr.openjdk.java.net/~jlaskey/8200380/webrev/index.html>
bug: https://bugs.openjdk.java.net/browse/JDK-8200380 <https://bugs.openjdk.java.net/browse/JDK-8200380>
csr: https://bugs.openjdk.java.net/browse/JDK-8200425 <https://bugs.openjdk.java.net/browse/JDK-8200425>