add arrayFrom ponyfill for IE11, add yarn.lock, add /node_modules to …

[mjsisley]

Add the array-from ponyfill to address #7 and rebassjs/rebass#239.

(Also added yarn.lock file and /node_modules to .gitignore).

[mjsisley]

Hey @jxnblk, I know you have a million things going on and are busy making other dope stuff all the time.... but if possible, I'd really love to get rebass working in IE11 (because rebass is dope... and I need to support IE11).

Anyways, if there is anything else from me needed to get this done... please let me know.

[quin]

@jxnblk pls

[jxnblk]

Thanks for putting this together and sorry for the delay!

1. I do NOT want to add a lock file to a library like this
2. Rather than a ponyfill, I think this issue could be solved with a hard-coded array

[mjsisley]

Thanks for all your awesome stuff!

Okay, lock file makes sense. I think a hardcoded array would be preferable as well.

Feel free to close this or leave open until you get the hardcoded array you want together (so there is something visible until then)