Add pagination to expenses

lib/data/repositories/expense_repository.dart

@@ -36,9 +36,10 @@ class ExpenseRepository {
     return expenseResponse.data;
   }
 
-  Future<BuiltList<ExpenseEntity>> loadList(
-      Credentials credentials, int createdAt, bool filterDeleted) async {
-    final url = credentials.url + '/expenses?created_at=$createdAt';
+  Future<BuiltList<ExpenseEntity>> loadList(Credentials credentials, int page,
+      int createdAt, bool filterDeleted) async {
+    final url = credentials.url +
+        '/expenses?per_page=$kMaxRecordsPerPage&page=$page&created_at=$createdAt';
 
     /* Server is incorrect if client isn't set
     if (filterDeleted) {

lib/redux/expense/expense_actions.dart

@@ -67,9 +67,10 @@ class LoadExpenseActivity {
 }
 
 class LoadExpenses {
-  LoadExpenses({this.completer});
+  LoadExpenses({this.completer, this.page = 1});
 
   final Completer completer;
+  final int page;
 }
 
 class LoadExpenseRequest implements StartLoading {}

lib/redux/expense/expense_middleware.dart

@@ -1,6 +1,7 @@
 // Flutter imports:
 import 'package:flutter/material.dart';
 import 'package:flutter/widgets.dart';
+import 'package:invoiceninja_flutter/constants.dart';
 
 // Package imports:
 import 'package:redux/redux.dart';
@@ -229,14 +230,22 @@ Middleware<AppState> _loadExpenses(ExpenseRepository repository) {
 
     store.dispatch(LoadExpensesRequest());
     repository
-        .loadList(
-            state.credentials, state.createdAtLimit, state.filterDeletedClients)
+        .loadList(state.credentials, action.page, state.createdAtLimit,
+            state.filterDeletedClients)
         .then((data) {
       store.dispatch(LoadExpensesSuccess(data));
+
+      if (data.length == kMaxRecordsPerPage) {
+        store.dispatch(LoadExpenses(
+          completer: action.completer,
+          page: action.page + 1,
+        ));
+      } else {
         if (action.completer != null) {
           action.completer.complete(null);
         }
         store.dispatch(LoadRecurringExpenses());
+      }
     }).catchError((Object error) {
       print(error);
       store.dispatch(LoadExpensesFailure(error));