Prepare align by adding `label` to table and crawl entities based on `ontology class`.

I added labels in order to align graphs easier.
`tvtropes` uses name as plain text in English, so I decided to use English label.

In addition, I started to crawl entities which are belong to `ontology class`, such as `Artist`, `Film` ... and so on.
```console
$ cat t.py 
select_by_class (s_name='author',
s=['dbpedia-owl:Artist', 'dbpedia-owl:ComicsCreator'],
+ p=['dbpedia-owl:author', 'dbpprop:author', 'dbpedia-owl:writer'],
entities=['dbpedia-owl:birthDate', 'dbpprop:shortDescription'])
$ pep8 t.py 
t.py:1:16: E211 whitespace before '('
t.py:2:1: E128 continuation line under-indented for visual indent
t.py:3:1: E122 continuation line missing indentation or outdented
t.py:4:1: E122 continuation line missing indentation or outdented
```