Move testutil to new go repository

[gfr10598]

Please also review the overall README file.

We may want to put more effort into the API and documentation. Not sure whether to do that first, or get something checked in and iterate.

---

This change is 

[coveralls]

Changes Unknown when pulling 7be9b7a on testutil into ** on master**.

[coveralls]

Changes Unknown when pulling 505feca on testutil into ** on master**.

[stephen-soltesz]

---

Reviewed 1 of 6 files at r1, 5 of 5 files at r2.
Review status: all files reviewed at latest revision, 2 unresolved discussions.

---

.travis.yml, line 9 at r2 (raw file):

# credentials.
#Z
#  * decrypt service account credentials

Let's try the service-account-as-environment-variables approach this time.

i.e. https://github.com/m-lab/travis/blob/master/setup_service_accounts_for_travis.sh

---

README.md, line 6 at r2 (raw file):

| master | [![Travis Build Status](https://travis-ci.org/m-lab/go.svg?branch=master)](https://travis-ci.org/m-lab/go) | [![Coverage Status](https://coveralls.io/repos/m-lab/go/badge.svg?branch=master)](https://coveralls.io/github/m-lab/go?branch=master) |

[![Waffle.io](https://badge.waffle.io/m-lab/go.svg?title=Ready)](http://waffle.io/m-lab/go)

With the advent of scrumdo what will be our relationship with waffle.io going forward?

---

Comments from Reviewable

[gfr10598]

Review status: all files reviewed at latest revision, 2 unresolved discussions.

---

.travis.yml, line 9 at r2 (raw file):

Previously, stephen-soltesz (Stephen Soltesz) wrote…

Let's try the service-account-as-environment-variables approach this time.

i.e. https://github.com/m-lab/travis/blob/master/setup_service_accounts_for_travis.sh

Ack - I'm doing that in the next PR.

---

README.md, line 6 at r2 (raw file):

Previously, stephen-soltesz (Stephen Soltesz) wrote…

With the advent of scrumdo what will be our relationship with waffle.io going forward?

Ack. Don't know. Will fix when we do.

---

Comments from Reviewable

[gfr10598]

Reviewed 1 of 6 files at r1, 5 of 5 files at r2.
Review status: all files reviewed at latest revision, 2 unresolved discussions.

---

Comments from Reviewable

[gfr10598]

Review status: all files reviewed at latest revision, 2 unresolved discussions.

---

.travis.yml, line 9 at r2 (raw file):

Previously, gfr10598 (Gregory Russell) wrote…

Ack - I'm doing that in the next PR.

Done.

---

README.md, line 6 at r2 (raw file):

Previously, gfr10598 (Gregory Russell) wrote…

Ack. Don't know. Will fix when we do.

Done.

---

Comments from Reviewable

[gfr10598]

OK

---

Review status: all files reviewed at latest revision, 2 unresolved discussions.

---

Comments from Reviewable

[stephen-soltesz]

---

Review status: all files reviewed at latest revision, 2 unresolved discussions.

---

Comments from Reviewable

[stephen-soltesz]

---

Review status: all files reviewed at latest revision, 2 unresolved discussions.

---

Comments from Reviewable

[gfr10598]

LGTM

---

Comments from Reviewable