Definition File Full Workflow - Acceptance Tests

[timlindvall]

This PR includes two commits...

fix: Allow quotes surrounding block-name.

Definition file output wraps the block-name in quotes, but there are existing rules in CSS Blocks disallowing this. This removes this rule, using stripQuotes() to unwrap the block-name value. With this change, block-name, block-id, and block-class will all behave in the same way.

test: Definition Files Basic Acceptance Tests.

• Test the full workflow of working with definition files. From a source block file, compile it into css and definition data, then reconstitute the block and validate the name, GUID, and properties match.
• Tests for both external definition files and embedded definition data.
• Update the mock importer to recognize embedded definition data.
• Add some comments to MockImporter and the registry.

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This PR only encompasses basic acceptance coverage using a source CSS Blocks file without any imports, exports, or aliases.

CI is going to fail because of missing types for ember-cli-htmlbars. Manually verified that yarn test in the /core directory is passing locally.

[timlindvall]

^ rebased off of latest ember-rewrite