Added calendar queries

pypodio2/areas.py

 # -*- coding: utf-8 -*-
+from datetime import datetime, timedelta
 import json
 
+
 try:
     from urllib.parse import urlencode
 except ImportError:
@@ -119,6 +121,12 @@ class Item(Area):
     def values_v2(self, item_id):
         return self.transport.GET(url='/item/%s/value/v2' % item_id)
 
+    def field_values(self, item_id, field_id):
+        return self.transport.GET(url='/item/%s/value/%s' % (item_id, field_id))
+
+    def field_values_v2(self, item_id, field_id):
+        return self.transport.GET(url='/item/%s/value/%s/v2' % (item_id, field_id))
+
     def create(self, app_id, attributes, silent=False, hook=True):
         if not isinstance(attributes, dict):
             raise TypeError('Must be of type dict')
@@ -621,3 +629,39 @@ class View(Area):
         return self.transport.PUT(url='/view/{}'.format(view_id),
                                   body=attribute_data, type='application/json')
 
+class Calendar(Area):
+
+    def get_app_calendar(self, app_id, start_time=datetime.now(), end_time=datetime.now() - timedelta(days=7)):
+        """Get the app's calendar from between the start_time and end_time
+        
+        Arguments:
+            app_id {int} -- The id of the app whose calendar is being queried
+        
+        Keyword Arguments:
+            start_time {datetime} -- The beginning date (default: {datetime.now()})
+            end_time {datetime} -- The ending date (default: {datetime.now()-timedelta(days=7)})
+        
+        Returns:
+            list -- List of calendar items from between the 2 given dates
+        """
+        dates = {
+            'date_from': start_time.strftime('%Y-%m-%d'),
+            'date_to': end_time.strftime('%Y-%m-%d')
+        }
+        return self.transport.GET(url='/calendar/app/{}'.format(app_id), **dates)
+
+    def get_global_calendar(self, start_time=datetime.now(), end_time=datetime.now() - timedelta(days=7)):
+        """Get the global calendar from between the start_time and end_time
+        
+        Keyword Arguments:
+            start_time {datetime} -- The beginning date (default: {datetime.now()})
+            end_time {datetime} -- The ending date (default: {datetime.now()-timedelta(days=7)})
+        
+        Returns:
+            list -- List of calendar items from between the 2 given dates
+        """
+        dates = {
+            'date_from': start_time.strftime('%Y-%m-%d'),
+            'date_to': end_time.strftime('%Y-%m-%d')
+        }
+        return self.transport.GET(url='/calendar', **dates)