v1.8.7

Bug fixes:
• Don't wipe name in Civi when there's no name in Mailchimp
• Sync stats / reporting fixes with - nested groups, skip storing error details in settings table

Performance / Improvements:
• Reduced no of API calls in Mailchimp to Civi sync.
• DB Error fix - Illegal mix of collations (utf8_general_ci,IMPLICIT) and (utf8_unicode) - as part of reduced api and performance work
• Optimizing sync process - filling up tmp_mailchimp_push_c and using CiviCRM API (than too many objects) on contact fetch
• Notice error fix - undefined index

New feature:
• A new setting - to delete subscribers at MailChimp instead of unsubscribe. Default remains as unsubscribe.