apache / commons-io / 540

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Pull #101

travis-ci

[IO-650] Improve IOUtils performance by increasing DEFAULT_BUFFER_SIZE

IOUtils had a 4096B default buffer size that is used by copy() and contentEquals() methods as well as a 2048B default buffer size used by skip() methods.  This number is being updated to 8192 for the following reasons:

1.  It has a big improvement in performance in benchmark tests (see IO-650 for details).
2.  It mirrors the default buffer size of java.io.Buffered* classes.  This makes buffer sizing consistent regardless of if it is being done internally in the method or externally via a Buffered*.  These classes are used internally in IOUtils as well so the buffer size is not unreasonable.

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