fix(Pagination): Improve performance of pagination

- Add limit parameter to find method.
 - Set absolute pagination elements limit to 1000.
 - Adding pagination validation, do not accept negative values. If
   negative values are detected, default parameters are used.

lib/Misc.js

@@ -11,6 +11,10 @@ function getPagination( query ){
 	}
 	if( query.elements ){
 		limit.elements = parseInt( query.elements ) || 10;
+		/** Safe pagination limit */
+		if( limit.elements > 1000 ){
+			limit.elements = 1000;
+		}
 	}
 	return limit;
 }
@@ -18,7 +22,7 @@ function getPagination( query ){
 async function queryPage( page , elements , model ){
     const skip = elements * page;
 	const total = await model.count();
-	const list = await model.find( {} , null, { skip : skip } );
+	const list = await model.find( null , null, { skip : skip , limit : elements } );
 	return {
         total : total,
         limit : elements,