Security Release against ZipSlip

The Snyk Security Research Team at Snyk.io reached out, and pointed out that the File.unzip method was vunerable to a ZipSlip, whereby a specially crafted zip file could write files outside of the destination folder...

See https://snyk.io/research/zip-slip-vulnerability for more info

This release fixes the vulnerability

Removed Closure.withDelegate, added byte[].hexdump()

Closure.withDelegate doesn't work in the majority of cases (especially the situation where you @Grab the library). For this reason, it has been removed from v0.5.7

I added byte[].hexdump() to give a nice hexdump view of byte arrays

withDelegate added to Closure

Not working in the wild though, only in the tests...

Collection<Number>.average() Bugfix for 0 length collections

v0.5.5

v0.5.5 Bugfix for 0 length collections

Added Collection<Number>.average()

v0.5.4

Up to v0.5.4 -- Added Collection<Number>.average()

Fixed List.rand

List.rand( n, false ) wasn't shuffling correctly for n < size and wasn't shuffling at all for n == size

Fixed and test applied

Added Iterator.rand

@ataylor284 kindly submitted code to randomly select elements from an Iterator