Add a function that lets you join strings together

[andria-dev]

The function string/join would be very useful to be able to join multiple strings together via a delimiter like a space or comma.

[joshuafcole]

Thanks again for your time, but we're going to hold back on trying to maintain 0.3 as well. We'd like to send you a couple of Eve stickers to show our appreciation anyway! Please email me if you're interested.