Merge pull request #101 from openwebwork/release/2.8.1

Release/2.8.1

That deals with the last of the issues I was having.  This "hotfix" has been open long enough, I think.
Fixed bug in how the files used to keep temporary data files are created.
Merge pull request #114 from KellyBlack/bugfix_create_temp_data_file

Bugfix create temp data file (develop)