More documentation: explanation of system design
minor additions to writeup
Merge branch 'master' of https://github.com/jywu/530Summarizer

Conflicts:
	writeup.tex
Merge branch 'master' of https://github.com/jywu/530Summarizer
Merge branch 'master' of https://github.com/jywu/530Summarizer

Conflicts:
	writeup.tex