Send code coverage report to coveralls.io
Fixed hpc-coveralls target test suite name
Added coveralls badge to README
Merge pull request #565 from guillaume-nargeot/master

Configuration to upload code coverage report on coveralls.io
Disallow top level cases with no arguments. Fixes #532
Merge pull request #566 from natefaubion/issue-532

Disallow top level cases with no arguments. Fixes #532