Version 0.9.0

• Added GitHub/Git support. It allows one to pull and run pipelines published on a
  remote GitHub repository
• Changed command line structure. Since this version it is organised in sub-commands.
  The following sub-commands are available:
  • ls: list all downloaded pipelines;
  • run: launch a pipeline execution;
  • pull: download or update a pipeline hosted on GitHub;
  • info: show pipeline information;
  • drop: remote a locally stored pipeline;
  • clone: copy a pipeline to a directory specified;
  • history: list all pipeline runs;
  • help: show program help.
• Added 'baseDir' and 'workDir' script variables
• Removed Merge processor