Increased modularity

- Made defines.tex actually work for each file
- Added layout.tex for layout-specific stuff
- Added bib.tex to auto-import the bibliography
- Added report.bib to centralize our references (see: https://en.wikibooks.org/wiki/LaTeX/Bibliography_Management#BibTeX)
- Added report.dbj to format our references correctly
- Updated Makefile to handle the new bibliography stuff