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.
If you need is just to populate an object you don’t have to do like this.  Firstly you should separate roles and choose right names.  From [SRP][] perspective `__init__` is having two responsibilities.  Although I could tell you the imperative way to achieve the principle I think it would be better if you consider yourself.  :wink: 

[SRP]: http://en.wikipedia.org/wiki/Single_responsibility_principle