REANA-Client 0.5.0

• Introduces new resources field in reana.yaml specification file
  allowing to declare computing resources needed for workflow runs, such as the
  CVMFS repositories via cvmfs subfield.
• Improves reana-client embedded command-line documentation (-help) by
  grouping commands and providing concrete usage examples for all commands.
• Enhances workflow start command allowing to override input parameters
  (--parameter) and to specify additional operational options
  (--option).
• Introduces new workflow run wrapper command that creates workflow, uploads
  its input data and code and starts its execution.
• Introduces new workflow stop command for stopping a running workflow.
• Enhances workflow logs command output capabilities via new --json
  option.
• Introduces new workflow diff command for comparing two workflow runs.
• Introduces new workflow delete command for deleting one or more workflow
  runs.
• Introduces new session open command allowing to run interactive sessions
  such as Jupyter notebook upon workflow workspace.
• Introduces new session close command for closing interactive sessions.
• Renames past workflows command to list allowing to list both workflow
  runs and interactive sessions.
• Introduces new workspace du command for checking workspace disk usage.
• Introduces new workspace mv command for moving files within workspace.
• Introduces new workspace rm command for removing files within workspace.
• Renames past workspace list command to ls allowing to list workspace
  files. Enhances its output capabilities via new --format option.
• Introduces new API function create_workflow_from_json() which allows
  developers and third-party systems to create workflows directly from JSON
  specification.