Password Protected archive/zip

[jalexmu...@gmail.com]

Hey Gophers!

There was a feature request on the Go issue tracker a few months back asking for the ability to read and write password protected zip files. I decided to pick it up and run with it and here are the results so far: https://github.com/alexmullins/zip[1] . And an example from the documentation:https://godoc.org/github.com/alexmullins/zip#example-Writer-Encrypt[2] . This is my first public Go project, so feedback is much appreciated!