Add a switch for zip functionality

nlp

@@ -35,6 +35,14 @@ def parse_arguments():
                         help='total number of cores available',
                         required=False,
                         type=int)
+    parser.add_argument(
+        '--zip',
+        action='store_true',
+        default=False,
+        dest='zip',
+        help='package result files in zip bundles',
+        required=False
+    )
     return parser.parse_args()
 
 
@@ -44,6 +52,7 @@ class NLPWorkflow(WorkflowRunner):
         self.lang = args.lang
         self.n_cores = args.n_cores
         self.output_dir = args.output_dir
+        self.zip = args.zip
 
     def workflow(self):
         if len(self.jobs) == 0:
@@ -93,14 +102,14 @@ class NLPWorkflow(WorkflowRunner):
 
         vrt_zip_jobs = []
         vrt_zip_job_dependencies = nlp_jobs
-        cmd = 'cd "%s" && zip vrt.zip */*.vrt -x "pyflow.data*" && cd -' % (
+        cmd = 'cd "%s" && zip -m vrt.zip */*.vrt -x "pyflow.data*" && cd -' % (
             self.output_dir
         )
         vrt_zip_jobs.append(
             self.addTask(
                 command=cmd,
                 dependencies=vrt_zip_job_dependencies,
-                label='vrt_zip_job_-_%i' % (index)
+                label='vrt_zip_job'
             )
         )