Feat/cron plugin

[woutslabbinck]

• add cronRule
• bump version koreografeye to v0.3.2 (fixes #6)
• make demo for Usage Control Policies (DemoUCPAgent.ts + indexUCP.ts)
  • Has a screencast
  • Has documentation on how to run (documentation/ucp/README.md)
  • Has documentation on the internal workings and the limitations/assumptions
• add Acl Plugin that uses the solid actor to update ACL resources
• add a CronPlugin that makes it possible to execute other plugins at a specific time
• Update OpenHABTranslator and solid actor to accomodate real IRIs instead of relative ones.
  • the util function extractItem was also updated for this reason
  • Written a subscription client to listens to additions to a container (SolidContainerNotificationClient.ts)
  • Added utility to authenticate with client credentials (CSS specific)
  • Added utility to set up a server easiliy with a function