Rename threaded_ methods to parallel_

Threads are an implementation detail. See discussion with @charliesome:
#503

lib/twitter/rest/api/direct_messages.rb

@@ -109,7 +109,7 @@ def direct_messages(*args)
         #   @param ids [Enumerable<Integer>] A collection of direct message IDs.
         #   @param options [Hash] A customizable set of options.
         def destroy_direct_message(*args)
-          threaded_objects_from_response(Twitter::DirectMessage, :post, '/1.1/direct_messages/destroy.json', args)
+          parallel_objects_from_response(Twitter::DirectMessage, :post, '/1.1/direct_messages/destroy.json', args)
         end
         deprecate_alias :direct_message_destroy, :destroy_direct_message
 

lib/twitter/rest/api/favorites.rb

@@ -49,7 +49,7 @@ def favorites(*args)
         #   @param tweets [Enumerable<Integer, String, URI, Twitter::Tweet>] A collection of Tweet IDs, URIs, or objects.
         #   @param options [Hash] A customizable set of options.
         def unfavorite(*args)
-          threaded_objects_from_response(Twitter::Tweet, :post, '/1.1/favorites/destroy.json', args)
+          parallel_objects_from_response(Twitter::Tweet, :post, '/1.1/favorites/destroy.json', args)
         end
         alias_method :destroy_favorite, :unfavorite
         deprecate_alias :favorite_destroy, :unfavorite

lib/twitter/rest/api/friends_and_followers.rb

@@ -157,7 +157,7 @@ def follow!(*args)
         #   @param users [Enumerable<Integer, String, Twitter::User>] A collection of Twitter user IDs, screen names, or objects.
         #   @param options [Hash] A customizable set of options.
         def unfollow(*args)
-          threaded_user_objects_from_response(:post, '/1.1/friendships/destroy.json', args)
+          parallel_user_objects_from_response(:post, '/1.1/friendships/destroy.json', args)
         end
         alias_method :destroy_friendship, :unfollow
         deprecate_alias :friendship_destroy, :unfollow

lib/twitter/rest/api/spam_reporting.rb

@@ -20,7 +20,7 @@ module SpamReporting
         #   @param users [Enumerable<Integer, String, Twitter::User>] A collection of Twitter user IDs, screen names, or objects.
         #   @param options [Hash] A customizable set of options.
         def report_spam(*args)
-          threaded_user_objects_from_response(:post, '/1.1/users/report_spam.json', args)
+          parallel_user_objects_from_response(:post, '/1.1/users/report_spam.json', args)
         end
       end
     end

lib/twitter/rest/api/tweets.rb

@@ -77,7 +77,7 @@ def status(tweet, options = {})
         #   @param options [Hash] A customizable set of options.
         #   @option options [Boolean, String, Integer] :trim_user Each tweet returned in a timeline will include a user object with only the author's numerical ID when set to true, 't' or 1.
         def statuses(*args)
-          threaded_tweets_from_response(:get, '/1.1/statuses/show', args)
+          parallel_tweets_from_response(:get, '/1.1/statuses/show', args)
         end
 
         # Destroys the specified Tweets
@@ -95,7 +95,7 @@ def statuses(*args)
         #   @param options [Hash] A customizable set of options.
         #   @option options [Boolean, String, Integer] :trim_user Each tweet returned in a timeline will include a user object with only the author's numerical ID when set to true, 't' or 1.
         def destroy_status(*args)
-          threaded_tweets_from_response(:post, '/1.1/statuses/destroy', args)
+          parallel_tweets_from_response(:post, '/1.1/statuses/destroy', args)
         end
         alias_method :destroy_tweet, :destroy_status
         deprecate_alias :status_destroy, :destroy_status
@@ -280,7 +280,7 @@ def retweeters_ids(*args)
         # @param path [String]
         # @param args [Array]
         # @return [Array<Twitter::Tweet>]
-        def threaded_tweets_from_response(request_method, path, args)
+        def parallel_tweets_from_response(request_method, path, args)
           arguments = Twitter::Arguments.new(args)
           Twitter::Utils.parallel_map(arguments) do |tweet|
             id = extract_id(tweet)

lib/twitter/rest/api/users.rb

@@ -191,7 +191,7 @@ def block?(user, options = {})
         #   @param users [Enumerable<Integer, String, Twitter::User>] A collection of Twitter user IDs, screen names, or objects.
         #   @param options [Hash] A customizable set of options.
         def block(*args)
-          threaded_user_objects_from_response(:post, '/1.1/blocks/create.json', args)
+          parallel_user_objects_from_response(:post, '/1.1/blocks/create.json', args)
         end
 
         # Un-blocks the users specified by the authenticating user
@@ -207,7 +207,7 @@ def block(*args)
         #   @param users [Enumerable<Integer, String, Twitter::User>] A collection of Twitter user IDs, screen names, or objects.
         #   @param options [Hash] A customizable set of options.
         def unblock(*args)
-          threaded_user_objects_from_response(:post, '/1.1/blocks/destroy.json', args)
+          parallel_user_objects_from_response(:post, '/1.1/blocks/destroy.json', args)
         end
 
         # Returns extended information for up to 100 users

lib/twitter/rest/api/utils.rb

@@ -49,7 +49,7 @@ def extract_id(object)
         # @param path [String]
         # @param args [Array]
         # @return [Array<Twitter::User>]
-        def threaded_user_objects_from_response(request_method, path, args)
+        def parallel_user_objects_from_response(request_method, path, args)
           arguments = Twitter::Arguments.new(args)
           Twitter::Utils.parallel_map(arguments) do |user|
             object_from_response(Twitter::User, request_method, path, merge_user(arguments.options, user))
@@ -101,7 +101,7 @@ def objects_from_array(klass, array)
         # @param path [String]
         # @param args [Array]
         # @return [Array]
-        def threaded_objects_from_response(klass, request_method, path, args) # rubocop:disable ParameterLists
+        def parallel_objects_from_response(klass, request_method, path, args) # rubocop:disable ParameterLists
           arguments = Twitter::Arguments.new(args)
           Twitter::Utils.parallel_map(arguments) do |object|
             id = extract_id(object)