Resolve JSON schema linter errors

raml/schemas/definitions/analysis.json

raml/schemas/definitions/avatars.json

raml/schemas/definitions/collection.json

raml/schemas/definitions/common.json

raml/schemas/definitions/container.json

raml/schemas/definitions/created-modified.json

raml/schemas/definitions/device.json

raml/schemas/definitions/file.json

raml/schemas/definitions/group.json

raml/schemas/definitions/job.json

raml/schemas/definitions/objectid.json

raml/schemas/definitions/project-template.json

raml/schemas/definitions/report.json

raml/schemas/definitions/string-id.json

raml/schemas/definitions/subject.json

raml/schemas/definitions/user.json

raml/schemas/input/avatars.json

raml/schemas/input/project-template.json

raml/schemas/mongo/avatars.json

raml/schemas/mongo/project.json