Add market endpoints

Author: mattantonelli

lib/xivapi/request.rb

@@ -55,12 +55,38 @@ def content(name: nil, ids: [], minify: false, limit: 100, columns: [])
   end
 
   # @param group [true, false] Group the servers by data center
-  # @return [Array<String>] list of servers
+  # @return [Array<String>] List of servers
   def servers(group: false)
     endpoint = group ? 'servers/dc' : 'servers'
     request(self, endpoint)
   end
 
+  # @param server [String] Server to retrieve the market for
+  # @param id [Integer] ID of the item to price
+  # @return [OpenStruct] Maret price results
+  def market_price(server: nil, id: nil)
+    request(self, "market/#{server}/items/#{id}")
+  end
+
+  # @param server [String] Server to retrieve the market for
+  # @param id [Integer] ID of the item to price
+  # @return [OpenStruct] Market history results
+  def market_history(server: nil, id: nil)
+    request(self, "market/#{server}/items/#{id}/history")
+  end
+
+  # @param server [String] Server to retrieve the market for
+  # @param id [Integer] ID of the category to retrieve
+  # @return [Array<OpenStruct>] Market category results
+  def market_category(server: nil, id: nil)
+    request(self, "market/#{server}/category/#{id}")
+  end
+
+  # @return [Array<OpenStruct>] List of Market categories
+  def market_categories
+    request(self, 'market/categories')
+  end
+
   # @param id [Integer] Character ID
   # @param all_data [true, false] Return the full set of character data
   # @param poll [true, false] Continuously call the API until a result is cached and returned