Remove dependency on commons IO?

[Ketan Padegaonkar]

There appear to be 2 (rather simple) classes from commons-io that are used by zt-exec.

This seems to pull down an entire library (and an older version of it). Would there be interest in a PR that includes a simple implementation of TeeOutputStream and NullOutputStream as part of zt-exec and remove the dependency on commons-io altogether?

[Toomas Romer]

Thank you, merged.