Set API page limit

lib/constants.dart

@@ -1,4 +1,5 @@
 // This version must be updated in tandem with the pubspec version.
 const String kAppVersion = '0.0.1';
 
+const int kMaxRecordsPerApiPage = 5000;
 const int kMillisecondsToRefreshData = 1000 * 60 * 15; // 15 minutes

lib/data/repositories/client_repository.dart

@@ -18,7 +18,7 @@ class ClientRepository {
   Future<BuiltList<ClientEntity>> loadList(CompanyEntity company, AuthState auth) async {
 
     final response = await webClient.get(
-        auth.url + '/clients?per_page=500', company.token);
+        auth.url + '/clients', company.token);
 
     ClientListResponse clientResponse = serializers.deserializeWith(
         ClientListResponse.serializer, response);

lib/data/repositories/invoice_repository.dart

@@ -18,7 +18,7 @@ class InvoiceRepository {
   Future<BuiltList<InvoiceEntity>> loadList(CompanyEntity company, AuthState auth) async {
 
     final response = await webClient.get(
-        auth.url + '/invoices?include=invitations&per_page=500', company.token);
+        auth.url + '/invoices?include=invitations', company.token);
 
     InvoiceListResponse invoiceResponse = serializers.deserializeWith(
         InvoiceListResponse.serializer, response);

lib/data/repositories/product_repository.dart

@@ -18,7 +18,7 @@ class ProductRepository {
   Future<BuiltList<ProductEntity>> loadList(CompanyEntity company, AuthState auth) async {
 
     final response = await webClient.get(
-        auth.url + '/products?per_page=500', company.token);
+        auth.url + '/products', company.token);
 
     ProductListResponse productResponse = serializers.deserializeWith(
         ProductListResponse.serializer, response);

lib/data/web_client.dart

@@ -2,12 +2,17 @@ import 'dart:async';
 import 'dart:core';
 import 'dart:convert';
 import 'package:http/http.dart' as http;
+import 'package:invoiceninja/constants.dart';
 
 class WebClient {
 
   const WebClient();
 
   Future<dynamic> get(String url, String token) async {
+
+    if (! url.contains('?')) url += '?';
+    url += '&per_page=${kMaxRecordsPerApiPage}';
+
     final http.Response response = await http.Client().get(
       url,
       headers: {