cli: implement run functionality

[audrium]

Usage: reana-client run [OPTIONS]

  Shortcut to create, upload, start a new workflow.

  The ``run`` command allows to create a new workflow, upload its input files
  and start it in one command.

  Examples:

       $ reana-client run -w myanalysis-test-small -p myparam=mysmallvalue

       $ reana-client run -w myanalysis-test-big -p myparam=mybigvalue

Options:
  -f, --file PATH                 REANA specification file describing the
                                  workflow to execute. [default=reana.yaml]
  -n, -w, --name, --workflow TEXT
                                  Optional name of the workflow. [default is
                                  "workflow"]
  --skip-validation               If set, specifications file is not validated
                                  before submitting it's contents to REANA
                                  server.
  -p, --parameter TEXT            Additional input parameters to override
                                  original ones from reana.yaml. E.g. -p
                                  myparam1=myval1 -p myparam2=myval2.
  -o, --option TEXT               Additional operational options for the
                                  workflow execution. E.g. CACHE=off.
  --follow                        If set, follows the execution of the
                                  workflow until termination.
  -t, --access-token TEXT         Access token of the current user.
  --help                          Show this message and exit.

Please note that it depends on #128