Switch cosm-rb local default to build/run with 1.9
Add debugger gem for debugging under ruby 1.9
If csv parsing gets empty content raise known exception

Don't let code get through to point where it tries to compare the size
of data with nil, as this is unhelpful.
Bump version to 0.2.07
Just run tests under MRI
Merge pull request #29 from smulube/bug/empty_csv_parsing

Bug/empty csv parsing