Changed, that the default limit_value for pagination is based on default_per_page

Closes elastic#68

Author: karmi

Diff for: elasticsearch-model/lib/elasticsearch/model/response/pagination.rb

@@ -50,7 +50,7 @@ def limit_value
               when search.definition[:size]
                 search.definition[:size]
               else
-                0
+                search.klass.default_per_page
             end
           end
 

Diff for: elasticsearch-model/test/unit/response_pagination_test.rb

@@ -13,7 +13,7 @@ def self.document_type; 'bar'; end
                  'hits' => { 'total' => 100, 'hits' => (1..100).to_a.map { |i| { _id: i } } } }
 
     setup do
-      @search    = Elasticsearch::Model::Searching::SearchRequest.new ModelClass, '*'
+      @search   = Elasticsearch::Model::Searching::SearchRequest.new ModelClass, '*'
       @response = Elasticsearch::Model::Response::Response.new ModelClass, @search, RESPONSE
       @response.klass.stubs(:client).returns mock('client')
     end
@@ -62,7 +62,7 @@ def self.document_type; 'bar'; end
 
     context "limit/offset readers" do
       should "return the default" do
-        assert_equal 0, @response.limit_value
+        assert_equal Kaminari.config.default_per_page, @response.limit_value
         assert_equal 0, @response.offset_value
       end