Begin converting to setuptools; currently in broken state.

We'll see how this goes. Need to update to use pkg_resources module,
embed our hacked bibtexparser, and some other things like that.
De-scriptify __init__.py
Example of accessing a resource data file

Todo: schema.sql, etc.
Add a quickie configure system so I can type 'make install'
Move bibtexparser into a renamed subpackage.
MANIFEST.in: stub
Hook up a 'dist' Make rule even though it's not super helpful
Convert everything to pkg_resources data loading
Split utilities out into util module.
Split config and secret-handling into modules
Move CLI commands into separate module

Surprisingly straightfoward, though this is all basically untested.
Split the database into its own module.
bibtools/unicode_to_latex.py: import and hook up

Note that (hacked_)bibtexparser includes its own variant of this, but this one
is better. I've fixed up a bunch of the mappings and the usability. The
bibtexparser version is aimed at LaTeX -> Unicode, whereas this one has been
shaped to be better at genuinely going Unicode -> LaTeX.
Split out proxy, webutil; bugfix

Too lazy to organize the commit.
Actually delete the old web/proxy code from __init__
Split out pdf-fetching routines
Split out generic bibliography-ish routines
Split out bibtex-related routines.
Split out text-format import/export.
Split out ADS-related functionality.