added new packages for bibliography
experiementing with different bibliography packages
Organize preamble matter

No logical reason to have two different files containing project-wide
commands.  Also removed an unneeded file from the old days.
switch to biblatex + biber for lab bibliographies

BibTeX just wasn't working out.  Switched to BibLaTeX + Biber.  Much
nicer to use.  Somehow avoids exhausting the file handle limit in TeX.
add backreferences
update make_util to use biber instead of bibtex
Merge pull request #464 from ayr0/bibtex

Bibliography Management using biblatex