Varargs stream factory methods

[Brian Goetz]

Currently we have, in Arrays:

     public static <T> Stream<T> stream(T[] array) {
         return stream(array, 0, array.length);
     }

     public static IntStream stream(int[] array) {
         return stream(array, 0, array.length);
     }

etc.

We *could* make these varargs methods, which is useful as creating 
ad-hoc stream literals:

   Arrays.stream(1, 2, 4, 8).map(...)

The downside is that we would have to lose (or rename) methods like:

     public static IntStream stream(int[] array,
                                    int fromIndex, int toIndex) {

since stream(1, 2, 3) would be ambiguous.

Probably better, make these static factories in the various stream 
interfaces:

   Stream.of("foo", "bar")

   IntStream.of(1, 2, 4, 8)