Not yet feature complete. This tag is only here to make certain depen…

…dency management tools happy that like to pin on a tag rather than a commit.

Merge pull request prometheus#226 from prometheus/beorn7/alloc

Bring back zero-alloc label-value access for metric vecs

Merge pull request prometheus#148 from prometheus/beorn7/release

Cut v0.7.0

Merge pull request prometheus#130 from prometheus/fabxc/cut

Cut 0.6.0.

Merge pull request prometheus#117 from prometheus/beorn7/release

Cut release 0.5.0.

Cut v0.4.0.