Merge pull request frankban#10 from frankban/dependencies-1510582470

Update dependencies.

Merge pull request frankban#8 from frankban/commentf

Switch to using Commentf, to be more compatible with gocheck.

Merge pull request frankban#7 from frankban/phony

Makefile: phony targets.

Merge pull request frankban#6 from frankban/add-ci

Enable CI and update dependencies.

Merge pull request frankban#5 from frankban/godoc-badge

Add godoc badge.

Merge pull request frankban#2 from frankban/dependencies-file

Add dependencies file.