lint/remark frail

[maxwondercorn]

Added --frail option to npm run lint:md so linting issues will throw errors in CI.

• Bumped ember-dictionary version
• Linted and edited README.md and CONTRIBUTING.md for consistency with the rest of the guides

This PR based on discussion in #79.

[maxwondercorn]

Sorry for the confusing PR. Reused the dead links linting branch, cleaned it up and created a new PR from it.

[jenweber]

Thank you! I ran this locally and it looks great. Merged.

[maxwondercorn]

Would you like me to implement this on the other guides?

[jenweber]

That would be awesome! Is there a way for us to run these tests on the diff of new PRs only? The Guides are massive and will have a thousand things to spellcheck or add as exceptions.

[maxwondercorn]

Not sure, I'd have to look into it to see what's possible. The worst case for spell checking would be the initial setup. It would catch the technical words that aren't already in the dictionary. I'd think I got most of the potential words in the dictionary based on the cli-guides. After that it would only be checking PRs.

For the ember guides proper, you'd only spell check the current release and upcoming release guides. All earlier versions would be put into the ignore file