[WIP] Rewrite everything

[blsqr]

This PR continues the work of #7 to rewrite everything. This should be most of the way to Version 1.0.

What does this PR do?

Implement a Bibliography class

This creates the OOP interface to which everything will couple.

[coveralls]

Pull Request Test Coverage Report for Build 35

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 32:	0.0%
Covered Lines:	69
Relevant Lines:	69

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 47

• 52 of 146 (35.62%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-44.3%) to 55.66%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
citationweb/bibliography.py	15	44	34.09%
citationweb/pdf_extract.py	37	102	36.27%
<!--	Total:	52	146	35.62%	-->

Totals
Change from base Build 32:	-44.3%
Covered Lines:	118
Relevant Lines:	212

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💛 - Coveralls