Add and create tests for constructing Diffbot API client.
Add comment for token instance variable.
Create basic article class.
Add api URL from diffbot.
Create function to generate article api url.
Encode URL with UTF-8 before sending it.
The optional parameters must only exist if they are requested.

That is, they are not true/false parameters. Existing is true and not is
false.
Create method to get content of URL.
Create Article Retrieval Exception.
Rename Artical Retreival Exception to Diffbot API Exception.
Remove stack trace printing for Unsupported Encoding Exception.
Start getArticle code.

Creates URL and requests the page.
Add getters for members of Article plus javadocs for them.
Create generic API entity.
Add throws declaration to parseResponse in Entity.
Add parsing for Article response into Article.
Parse out tags from response.
Move Article into an entity package.
Create basic Media class with Type enum.
Add method of creating a Type from a human-readable name of a type.