RFR : 8013712 : (XS) Add Objects.nonNull and Objects.isNull

[Jeff Hain]

Hello.


nonNull could be renamed into isNonNull,
else people might use it instead of requireNonNull,
especially if they are already used to a pre-Java 7
requireNonNull that would be called nonNull.
(example:
http://grokbase.com/p/openjdk/core-libs-dev/111tbha823/code-review-7012540-java-util-objects-nonnull-incorrectly-named
)


It would also be more consistent with isNull.



-Jeff