Add commitizen and commitlinter

[aesedepece]

• I have read and understood docs/CODE_OF_CONDUCT document.
• I have read and understood docs/styleguide document.
• I have included tests for the changes in my PR. If not, I have included a rationale for why I haven't.
• My code is formatted and is accepted by yarn fmt-verify.
• I understand my PR may be closed if it becomes obvious I didn't actually perform all of these steps.

Why this change is necessary and useful

As suggested by @mariocao and discussed in #63, this PR adds commitizen to our project. It also adds commitlinter to guarantee that GitHub rejects PRs with commit messages not abiding by our guidelines.

Implications

All commits should now abide by Angular's conventional changelog convention.

Why this PR doesn't include tests

No actual testable code was modified—only configuration files.

[aesedepece]

This is still not ready to be merged. I need yet to clean up my commits and rebase it all.

…

On Fri, 1 Jun 2018 10:35 Johann Og, ***@***.***> wrote: ***@***.**** approved this pull request. — You are receiving this because your review was requested. Reply to this email directly, view it on GitHub <#69 (review)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABQWV2_MfGIyB7lajtfshkX5vYQlWkRaks5t4PzlgaJpZM4UVFIe> .