Merge pull request #2286 from kivy/image_loader

uix:Image delayed importing of loader. Import it only when used

kivy/core/image/__init__.py

@@ -445,8 +445,6 @@ class Image(EventDispatcher):
         else:
             raise Exception('Unable to load image type {0!r}'.format(arg))
 
-        # check if the image hase sequences for animation in it
-        self._img_iterate()
 
     def remove_from_cache(self):
         '''Remove the Image from cache. This facilitates re-loading of

kivy/uix/image.py

@@ -55,9 +55,10 @@ from kivy.core.image import Image as CoreImage
 from kivy.resources import resource_find
 from kivy.properties import StringProperty, ObjectProperty, ListProperty, \
     AliasProperty, BooleanProperty, NumericProperty
-from kivy.loader import Loader
 from kivy.logger import Logger
 
+# delayed imports 
+Loader = None
 
 class Image(Widget):
     '''Image class, see module documentation for more information.
@@ -303,6 +304,9 @@ class AsyncImage(Image):
     def __init__(self, **kwargs):
         self._coreimage = None
         super(AsyncImage, self).__init__(**kwargs)
+        global Loader
+        if not Loader:
+            from kivy.loader import Loader
         self.bind(source=self._load_source)
         if self.source:
             self._load_source()