8.1.0-rc

[roc]

Installs exact versions of hmpo dependency list

• uses versions that should allow 8.0.0 users to transition to 8.1.0 without errors
• updates and pins hmpo-template-mixins to 4.3.0
• these were the versions that allowed me to run our current master branch of evw-self-serve without errors, but with new styling changes from hmpo-template-mixins

As a note on the pinning policies in hof, I'd be keen for all future releases to come with exact package numbers in the package.json file as well as the bundled npm-shrinkwrap.json.

• Having the exact packages in package.json is explicit and allows us to know what we should be getting
• Having the shrinkwrap file allows you to have confidence in all sub-packages

  Update to 8.1.0

• Changelog updated accordingly

(Duplicate of #152 but into the new release/v8 branch)

[easternbloc]

Fix my comment and I shall publish your changes.

[roc]

closing cos #154