ci: circle migration, build test, prepare and prepublishOnly

[atlawrie]

Migrates our CI pipeline from Travis to CircleCI. Adds an additional test step to our CI process to test successful builds. Adds additional scripts to ensure properly updated dist prior to release.

[commit-lint[bot]]

Continuous Integration

• circle: migrate from travis to circle (8c961c1)
• deploy: remove build (a6faa9e)
• config: change docker to browsers (6029f92)
• travis: remove travis config (3c23e61)
• test: add lint step (5890093)

Circle

• deploy: add prepare and prepublishOnly (731fc9d)

Contributors

atlawrie

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