Update OCR app

Add keyword arguments. Update URL parameters to the "_id" form.
Updated view tests.

Signed-off-by: Roberto Rosario <Roberto.Rosario.Gonzalez@gmail.com>

mayan/apps/ocr/runtime.py

@@ -5,5 +5,5 @@ from django.utils.module_loading import import_string
 from .settings import setting_ocr_backend, setting_ocr_backend_arguments
 
 ocr_backend = import_string(
-    setting_ocr_backend.value
+    dotted_path=setting_ocr_backend.value
 )(**setting_ocr_backend_arguments.value)