changes to urlize bag files by check machine url. removed the explicit check in access_url method inside Bag model. Fixes #175
Merge branch 't160_bag_pk_changes' into t175_bag_url_handling
Test case changes for bag url handling. ref #175
Test cases for urlize_with_label template tag. Fixes #189
Merge pull request #185 from gwu-libraries/t175_bag_url_handling

T175 bag url handling