What's the license on these?

It would be very handy if there was an explicit license in this repo (may I suggest Apache 2.0?).
Legally speaking, no posted license default to "you can't use this in any way," so lack of a license file prevents a lot of people a companies with lawyers from even looking at this.
Thanks! These are very cool, would be great to have clarity on how they are allowed to be used.

