rename randexam.tex to randexam-dev-manual.tex
separate out user instructions into randexam-user-manual.tex
re-enable email sending and add sleep on fail
add timeouts for email sending
convert iteritems() -> items() for python 3.X compatability
comment out usage of scipy for curving
fix error-reporting bug in read_scores() and read_answers()
fix CSV writing newlines on Windows