closes#5492
- remove core/server/require-tree.js and split it into modules
- add read-directory module to recursively read directories
- add validate-themes module to scan themes and return errors/warnings
- add parse-package-json module to parse json and validate requirements
- rewrite core/server/models/index.js to manually require models
Progress on #2095
- Add new AppPermissions class with read() method
- has default permissions to read and browse posts
- uses default permissions if no package.json
- uses default permissions if no ghost object in package.json
- errors when reading malformed package.json
- uses ghost.permissions if found in package.json