[MODEL] Call Hashie.disable_warnings method in Response wrappers

Adding to change introduced in 5732fa3, this patch disables the
warnings Hashie prints out when a key clashing with a built-in method
is being added.

Related: elastic#666

Author: karmi

elasticsearch-model/lib/elasticsearch/model/response/aggregations.rb

@@ -3,6 +3,8 @@ module Model
     module Response
 
       class Aggregations < Hashie::Mash
+        disable_warnings if respond_to?(:disable_warnings)
+
         def initialize(attributes={})
           __redefine_enumerable_methods super(attributes)
         end

elasticsearch-model/lib/elasticsearch/model/response/suggestions.rb

@@ -3,6 +3,8 @@ module Model
     module Response
 
       class Suggestions < Hashie::Mash
+        disable_warnings if respond_to?(:disable_warnings)
+
         def terms
           self.to_a.map { |k,v| v.first['options'] }.flatten.map {|v| v['text']}.uniq
         end