more discussion questions from Jaime
fix merge conflict
another discussion question
a philosophical question
incentives
get table 1 to float to the right place
more de-anonymizing
edited the abstract
tweak to abstract
various small tweaks
rewrite motivations for creating CloudCoder
some minor edits
various formatting and minor edits
cite AGPL
more small edits
editing exercises section, add some refs
some revisions to building/testing
a couple edits to data collection section
edits to hosting section
more acknowledgments before references