feat(responsibilities): extract object responsibilities from JSDoc comments

[gregswindle]

User story

As an engineer, analyst, or designer,
I need to understand an object's stated purpose
In order to determine whether its design could be improved.

Acceptance criteria

• 1. doctrine parses JSDoc comments to createResponsibility objects.
• 2. Responsibility objects are associated with source objects.
• 3. Responsibilities are output as enumerated lists in a CRC Model's "Responsibilities" section.
• 4. Class descriptions display under a CRC Model's Name whenever JSDoc annotations exist for them.