proycon/clam: v3.2

Users using OAuth2 or OpenID Connect are urged to upgrade to this release because of security improvements:

• Removed OAuth2 tokens from query parameters #109 , now using cookies instead
• Generate Dockerfile with clamnewproject #104
• Allow JSON-LD content request for service metadata, using schema.org vocabulary #110
• Allow using OAuth2 and HTTP Basic at the same time
• Implemented USERS_FILE directive to load user credentials from a simple tsv file
• Made wrapper shell script template POSIX-compliant
• Revised documentation regarding installation and deployment, favouring containerised setups (e.g. Docker) in production scenarios.