[WIP] Extractor database

[PROxZIMA]

Description

A database manager for the Crawler and the Extractor modules. Neo4j is the most suitable candidate of all as it's fast, scalable and is capable of storing huge amount of data; that too in graphical manner. This makes it easier to understand and manipulate as per our need.

Motivation and Context

The goal is to use a unified platform to store all the information for both crawler and extractor. Fixes #32

How Has This Been Tested?

TODO

Screenshots (if appropriate):

Neo4j database for depth 1 crawl

Some logs

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.