Contact tags & interests

Operations for contact tags & interests.

• GETList interest categorys/api/v1/interest-categories
• POSTCreate a interest category/api/v1/interest-categories
• DELETEDelete a interest category/api/v1/interest-categories/{category}
• POSTTags a contact/api/v1/contacts/{contact}/tags
• PUTInterests a contact/api/v1/contacts/{contact}/interests