made validation default behaviour

Author: gkiar

run.py

@@ -41,15 +41,15 @@ def run(command, env={}):
                    'provided all subjects should be analyzed. Multiple '
                    'participants can be specified with a space separated list.',
                    nargs="+")
-parser.add_argument('--validate', help='Whether or not to perform BIDS dataset validation',
+parser.add_argument('--skip_bids_validator', help='Whether or not to perform BIDS dataset validation',
                    action='store_true')
 parser.add_argument('-v', '--version', action='version',
                     version='BIDS-App example version {}'.format(__version__))
 
 
 args = parser.parse_args()
 
-if args.validate:
+if not args.skip_bids_validator:
     run('bids-validator %s'%args.bids_dir)
 
 subjects_to_analyze = []