- Get rid of all instance-to-class delegation. This is unnecessary/redundant.
- Remove trivial methods #convert_string_to_array, #clean_up_array and replace with a single "format_tags_for(context, value)" method to take care of this.
- Remove trivial method #convert_array_to_string. Same as Array#join
- raise InvalidTagsFormat error if attempting to set tags to something other than an Array or String