Implement .mobi parser

Eliminate dependency on ebooklib

parsers/epub.py

@@ -67,11 +67,3 @@ class ParseEPUB:
         file_settings = {
             'images_only': False}
         return self.book['book_list'], file_settings
-
-class HidePrinting:
-    def __enter__(self):
-        self._original_stdout = sys.stdout
-        sys.stdout = None
-
-    def __exit__(self, exc_type, exc_val, exc_tb):
-        sys.stdout = self._original_stdout