Move to public domain

Right now the project [as originally published](https://github.com/project-open-data/project-open-data.github.io/commit/e1428123786b21c8ff64ca99c3f579a4fcf6ec95) is a work of the United States government and thus is not subject to *domestic* copyright protection. Subsequent non-government contributors retain their copyright and license their work under either the MIT or CC-BY licenses for code and text respectively. This pull requests is intended to facilitate a discussion on the desirability of moving the project entirely to the public domain.

## Issues to discuss

- [ ] Will a requirement that contributors waive all rights discourage (chill) casual contributors?
- [ ] Contributor friction added by using a non-standard licensing scheme
- [ ] Standard-setting implications beyond this project 
- [ ] If public domain is so great and all that, why isn't all non-commercial open source software public domain?
- [ ] International copyright (e.g., if another government wants to fork and use?) @david-a-wheeler?
- [ ] Dedication of current :copyright: holders rights
- [ ] Obligatory OGC review because :hammer:

## Current :copyright: holders

*If you would like to manifest your intent to relinquish all copyright claims to your prior contributions to the project, both code and text, under the terms described in this pull request, please reply with (at least) a :+1: (or a :-1: if you would prefer not to do so... which is your choice).*

- [x] @benbalter ([19 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=benbalter))
- [x] @jpmckinney ([17 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=jpmckinney))
- [x] @andrew-wolfe ([9 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=andrew-wolfe))
- [x] @jqnatividad ([8 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=jqnatividad))
- [x] @DruidSmith ([5 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=DruidSmith))
- [x] @willpugh ([3 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=willpugh))
- [x] @mhogeweg ([3 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=mhogeweg))
- [x] @philipashlock ([2 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=philipashlock))
- [ ] @jonasalmeida ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=jonasalmeida))
- [x] @listrophy ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=listrophy))
- [x] @calvinmetcalf ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=calvinmetcalf))
- [x] @jedsundwall ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=jedsundwall))
- [x] @acouch ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=acouch))
- [x] @tauberer ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=tauberer))
- [x] @leahbannon ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=leahbannon))
- [x] @lourinaldi ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=lourinaldi))
- [x] @meiqimichelle ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=meiqimichelle))
- [x] @dotmike ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=dotmike))
- [x] @GUI ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=GUI))
- [x] @pborreli ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=pborreli))
- [x] @wilhelmbot ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=wilhelmbot))
- [x] @dsmorgan77 ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=dsmorgan77))
- [x] @jhawk28 ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=jhawk28))
- [x] @nice-giraffe ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=nice-giraffe))
- [x] @pschweitzerusgsgov ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=pschweitzerusgsgov))
- [x] @russellpwirtz ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=russellpwirtz))
- [x] @scor ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=scor))

## :us: Contributors

- [x] @haleyvandyck ([64 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=haleyvandyck))
- [x] @MarinaMartin ([7 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=MarinaMartin))
- [x] @stevenvdc ([5 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=stevenvdc))
- [x] @feomike ([4 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=feomike))
- [x] @gbinal ([3 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=gbinal))
- [x] @MikePulsiferDOL ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=MikePulsiferDOL))
- [x] @nsinai ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=nsinai))
- [x] @rypan ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=rypan))
- [x] @danmunz ([1 contributions](https://github.com/project-open-data/project-open-data.github.io/commits?author=danmunz))

List built using [this simple script](https://gist.github.com/benbalter/6334846) and the GitHub Contributors API. I checked off those contributors who I knew to be government employees... please let me know if I was over inclusive in any case.

Thoughts?