first version of new contact resource
add enums for kind-filter of pdf templates
add wildcard search and kind-filter to email templates
merged master
changed template kind-enums to use contact instead of client
update field descr for related_object_type
add valid enums to pdf_template filter[kind]
add missing type: string to sort parameter
remove client_id from sort_by-parameter in doc list views (it makes no sense to sort by a UUID)
deprecate client, client_id  in favour of contact, contact_id for documents
deprecate filter[client_ids] in favour of filter[contact_ids] for documents index
add new lead related fields to contact
add parent_id for contact
update changelog
Update CHANGELOG.md
enhanced  description for document copy
Merge branch 'develop' of github.com:salesking/sk_api_schema into develop
add is_employee to contact
bump version 0.7