Add option to disable bookmark URL validation (#57)

* Add option for disabled bookmark URL validation (#36)

* Add options documentation (#36)

bookmarks/validators.py

@@ -0,0 +1,14 @@
+from django.conf import settings
+from django.core import validators
+
+
+class BookmarkURLValidator(validators.URLValidator):
+    """
+    Extends default Django URLValidator and cancels validation if it is disabled in settings.
+    This allows to switch URL validation on/off dynamically which helps with testing
+    """
+    def __call__(self, value):
+        if settings.LD_DISABLE_URL_VALIDATION:
+            return
+
+        super().__call__(value)