Update document parsing app

Update URL parameters to the "_id" forms. Add keyword arguments.
Remove use of is_path in the DOCUMENT_PARSING_PDFTOTEXT_PATH
setting.

Signed-off-by: Roberto Rosario <Roberto.Rosario@mayan-edms.com>

mayan/apps/document_parsing/exceptions.py

@@ -5,4 +5,3 @@ class ParserError(Exception):
     """
     Base exception for file parsers
     """
-    pass