add offset and limit to learning objects/collections index

app/controllers/v1/collections_controller.rb

@@ -11,7 +11,9 @@ class V1::CollectionsController < ApplicationController
   # GET /v1/collections
   # GET /v1/collections.json
   def index
-    render json: Collection.all
+    limit = params[:limit] || 10
+    offset = params[:offset] || 0
+    render json: Collection.limit(limit).offset(offset)
   end
 
   # GET /v1/collections/1

app/controllers/v1/learning_objects_controller.rb

@@ -15,7 +15,7 @@ class V1::LearningObjectsController < ApplicationController
     limit = params[:limit] || 10
     offset = params[:offset] || 0
     serializer = params[:obaa].nil? ? LearningObjectSerializer : LearningObjectObaaSerializer
-    render json: LearningObject.limit(limit).offset(offset).all, each_serializer: serializer
+    render json: LearningObject.limit(limit).offset(offset), each_serializer: serializer
   end
 
   # GET /learning_objects/1