Added some es6 snippets

[chief10]

Added some es6 snippets to compliment what is already here. The commands for them are the same with the exception of being prepended with an 'e'.

[justinj]

Nice! I can't help but feel like it might be better to have a completely separate set of snippets for this, though? It doesn't seem like a super common use case to be using the old syntax and new syntax at the same time (but feel free to correct me here). There's a set in #2, but I'm not sure how I want to handle it, I think a separate repo is probably best so these still exist for ES5. If either of @mileszs or @kevinold (or you!) want to make a new repo for it I'll link to it, otherwise I can make a new one.

[chief10]

You are probably right about that. I'll for sure start a new repo over the weekend if no one else wants to -- that will give me a chance to fix a couple of issues I see with what I added.

Good work on this though man, and Thanks!