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.
Naming convention and consistency are important, because they make API *predictable*.  The most of ordinal Python programmers are familiar with PEP 8 and common naming rules of Python e.g. PascalCase for type names, ALL_UPPER_CASE for constant names, all_lower_and_underscore for rest of all, and they *predict* there should be a column named `notable_work`, not `notableWork`.

Is this explanation enough?