RFR JDK-8003258: BufferedReader.lines()

[Henry Jen]

Hi,

Please review webrev at

http://cr.openjdk.java.net/~henryjen/ccc/8003258.1/webrev/

It adds a method to BufferedReader.

public Stream<String> lines() {}

A class java.io.UncheckedIOException is also added as a general approach
for wrapping up an IOException to be unchecked.

Cheers,
Henry