Skip operation

[Paul Sandoz]

Hi,

Please see here for an implementation of the skip operation:

  http://cr.openjdk.java.net/~psandoz/lambda/skip/webrev/

Skip can be combined with limit to obtain a sub-stream.

The skip impl currently has a dumb parallel implementation.

This patch is based on the previous one [1] for infinite streams.

Paul.

[1] http://cr.openjdk.java.net/~psandoz/lambda/inf/webrev/

which is based on:

http://cr.openjdk.java.net/~psandoz/lambda/limit/webrev/