fix looping description
shorten subset syntax
fix issues, spacing, remove last OYO
merge commit and cleanup of Lab 2

Merge remote-tracking branch 'upstream/master' into mosaic

Conflicts:
	lab0/lab0.Rmd
	lab1/lab1.Rmd
	lab3/lab3.Rmd
	lab4/lab4A.Rmd
	lab4/lab4A.html
	lab4/lab4B.Rmd
	lab4/lab4B.html
	lab5/lab5.html
	lab6/lab6.html
	lab7/lab7.Rmd
	lab7/lab7.html
	lab8/lab8.Rmd
	lab8/lab8.html
	oldLatex/lab7/lab7.pdf