add ManyToMany for (Image, Deployment)
diff --git a/planetstack/core/models/image.py b/planetstack/core/models/image.py
index 4399c60..0bca22f 100644
--- a/planetstack/core/models/image.py
+++ b/planetstack/core/models/image.py
@@ -10,6 +10,7 @@
     disk_format = models.CharField(max_length=256)
     container_format = models.CharField(max_length=256)
     path = models.CharField(max_length=256, null=True, blank=True, help_text="Path to image on local disk")
+    deployments = models.ManyToManyField('Deployment', through='ImageDeployments', blank=True, help_text="Select which images should be instantiated on this deployment", related_name='images')
 
     def __unicode__(self):  return u'%s' % (self.name)