[WIP] Add support for running wasm-snip

[csmoe]

Closes #158

Make sure these boxes are checked! 📦✅

• You have the latest version of rustfmt installed and have your
  cloned directory set to nightly

$ rustup override set nightly
$ rustup component add rustfmt-preview --toolchain nightly

• You ran rustfmt on the code base before submitting
• You reference which issue is being closed in the PR text

✨✨ 😄 Thanks so much for contributing to wasm-pack! 😄 ✨✨

[ashleygwilliams]

hey @csmoe ! thanks so much for this- it's looking really good. so we have a release coming up on wednesday and i think, unfortunately we're not gonna be able to sneak this in because there's some outstanding questions re #160 about configuration. i'm gonna make this as blocked for the moment, but the second after we get the most recent release out, i'll turn my attention back to this and see if we can't land it sooner than later and add the configuration option later so that we don't have to run you through too many rebases 😅 thanks again for submitting and sorry for having to ask you to wait, but hopefully it shouldn't be too long ✨ 💁

[mgattozzi]

Real solid PR! Like Ashley said we'll need to hold off on this but this is great :D

[nicksrandall]

@csmoe are you still planning to work on this? If you've run out of bandwidth, I'd be happy to help. I'd like to get this and wasm-opt integration in.

[csmoe]

@nicksrandall really thanks. just do whatever you wanna.

[ashleygwilliams]

this PR is quite outdated- i'm sorry about this :( would you mind if we closed? we still want this feature but i imagine it will be easier to start a new PR to accomplish this. let me know what you think!

[csmoe]

yep It's better to restart