Add ContentReader. Clean up old files. Begin refactoring Article -> Content
Add locale support for content
Move TestCase subclasses to their own namespace
Fix ContentReader when requesting default locale
Move tests for base classes back into tests
Add GET /paths/{path}

Add tests for reading content through HTTP
Update configuration and tests
Read content by ID or Slug
Add GET /contents/{contentId}/
Remove Article
Reorganize tests
Allow reading content directly given a path