StreamSupport -> Streams?

[Brian Goetz]

Now that Streams has no more public members, it was suggested we move 
the public factories (stream() and parallelStream()) to Streams and 
garbage-collect StreamSupport.

The motivation for the somewhat more ungainly name StreamSupport was to 
make it clear(er) that these were low-level methods intended for 
developers of data structures, and mixing them with the for-the-public 
methods in Streams like concat() was confusing.  But now all the 
for-the-public methods in Streams are gone.