added lab 5
fixed some wording
add XXX's, fix typos
added more instructions and correct s3 buckets
added more instructions
added more instructions
added username
Merge branch 'lab5'
added lab index
lec 8 notes
pass on readme
updated with more cautionary instructions
finalized lab
more terminate job instructions
added scratch location for emr
add guest lecture titles
Merge branch 'master' of github.com:mitdbg/asciiclass
minor
minor
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