Merge branch 'sentences_key' into 'master'

Sentences key

See merge request !3

src/converter.py

@@ -108,6 +108,9 @@ def ccl2json(path_in, path_out, tagset='nkjp', json_text=True):
             data_out = {
                 "filename": pathlib.Path(path_in).stem,
                 'tagset': tagset,
+                'sentences': [sentence.as_dict()
+                              for sentence in
+                              parser.getContentHandler().get_sentences()],
                 'tokens': [_convert_tagset_in_token(token.as_dict(), tagset)
                            for token in parser.getContentHandler().get_tokens()]
             }