v5.8.0

• create node-pkware/stream namespace for the original code
• update readme: replace require statement with import statements, as require hasn't been supported for a long time
• update readme: add more examples for the simple api
• update readme: make the usage of the stream api explicit
• make simple/Explode and simple/Implode have the same signature internally (input passed into constructor, output can be read with .getResult())