Bug fixes

Changes since 8.x-2.0:

• #3003878 by jrglasgow: need ability to add new certificate to metadata before old cert expires
• removing some debugging code
• modified the config forms to ensure that if a setting is overridden the field is disabled and showing the overridden settings

Changes since 7.x-2.5:

• #3003878 by jrglasgow: need ability to add new certificate to metadata before old cert expires
• fixing error when detecting the 2.x branch of the php-saml library

Update Drupal to 7.59
Update Archibald to 3.13

Following the latest DSB API changes, JSON validation is more strict.
Make sure empty classification items are not exported in the JSON file.

- Fix chrome delete config in edit variables of less compiler,
- Fix broken submit on less config.