Default JSON Schemas for validation

[farshidtz]

The Docker image and debian packages should include and use default validation schemas.

In Dockerfile, those can be downloaded from upstream repos during the build stage. The local copies should be removed.

The path to the files may be set using jq or environment variables.

Need to update the wiki too:
https://github.com/linksmart/thing-directory/wiki/Deployment
https://github.com/linksmart/thing-directory/wiki/Configuration

Tasks:

• Download from upstream repos
• Remove local copies
• Set path using jq in docker build stage
• Set path in debian package
• Update download links in wiki
• Update deployment details in wiki