all: upgrade to v3, add go.mod

all: upgrade to v3, add go.mod

build: remove go.mod

It turns out introducing modules for packages that have already tagged
v2.0.0 or higher is quite a bit more complicated than I expected. So
let's just pretend this never happened, and I'll try again in a
subsequent commit.

build: add go.mod

Fix typo

Fix typo

travis: test under Go 1.6.x, 1.7

Also deprecate the 1.5 series pre 1.5.4 (the last 1.5.x point release)

travis: test under Go 1.6.x, 1.7

Also deprecate the 1.5 series pre 1.5.4 (the last 1.5.x point release)

Goji: Stable Release

Goji: Stable Release