Merge pull request #6 from beanumber/clean

lab0 renders to HTML be default
Update and rename to-do.md to labSourceStyleGuide.md

rename and move to-do to "issues" on GitHub
update css fonts
small changes
resolving merge conflict
Merge branch 'naomilong-master'
add lab5 markdown
conform style of lab0
second read through corrections
removed redundant reference to data.frame in subset() command
second pass on Lab 4A
second look at Lab 5
second look at Lab 6
conform style Lab 7
conform style Lab 8
merged upstream changes

Merge branch 'clean' of github.com:beanumber/oiLabs into mosaic

Conflicts:
	lab0/lab0.html
	lab1/lab1.Rmd
	lab1/lab1.html
	lab2/lab2.Rmd
	lab2/lab2.html
	lab3/lab3.Rmd
	lab3/lab3.html
	lab4/lab4A.Rmd
	lab4/lab4A.html
	lab5/lab5.Rmd
	lab5/lab5.html
	lab6/lab6.Rmd
	lab6/lab6.html
	lab7/lab7.Rmd
	lab7/lab7.html
	lab8/lab8.Rmd
	lab8/lab8.html