add minimum, maximum and step to integer and float questions, to make sliders possible

lib/quby/compiler/entities/questions/float_question.rb

@@ -5,6 +5,15 @@ module Quby
     module Entities
       module Questions
         class FloatQuestion < Question
+          def as_json(options = {})
+            super.merge(
+              minimum: minimum,
+              maximum: maximum,
+              step: 0.01, # fixed in v1.
+              # defaultPosition: default_position # Needs discussion, can be number or string "hidden"
+            )
+          end
+
           def size
             @size || 30
           end

lib/quby/compiler/entities/questions/integer_question.rb

@@ -5,6 +5,15 @@ module Quby
     module Entities
       module Questions
         class IntegerQuestion < Question
+          def as_json(options = {})
+            super.merge(
+              minimum: minimum,
+              maximum: maximum,
+              step: 1, # fixed in v1.
+              # defaultPosition: default_position # Needs discussion, can be number or string "hidden"
+            )
+          end
+
           def size
             @size || 30
           end