Release 0.7.2 (google#273)

* Release 0.7.2
* Bump CI versions

Release 0.7.1 (google#265)

Publish 0.7.0 (google#240)

Release 0.6.0 (google#238)

Release 0.5.10 (google#227)

Merge pull request google#212 from Polymer/git-local-resolve

Detect relative local git repo paths in a more reliable way

Release v0.5.8

Release v0.5.7

Release 0.5.6

Release 0.5.5