hg: lambda/lambda/jdk: StringJoiner::merge spec and test

[henry.jen at oracle.com]

Changeset: 559d3b0cbf34
Author:    henryjen
Date:      2013-07-01 13:37 -0700
URL:       http://hg.openjdk.java.net/lambda/lambda/jdk/rev/559d3b0cbf34

StringJoiner::merge spec and test

! src/share/classes/java/util/StringJoiner.java
+ test/java/util/StringJoiner/MergeTest.java
! test/java/util/StringJoiner/StringJoinerTest.java