setup association between data_sources and export_runs
added some relation information to the data_sources index
added navigation link
create seed data
added sort_links and search
Whoops.. added these files
Added export_sets resource
gave the export_set a better title by pulling data from the run. Hmmm...
trying to wire up the many to many
Wow... big refactor for renaming the model
fixed up model to use through to get back to data sources.
updated views
More data.
Added migrations
Work in progress
More model work.....
yet more model work
Started to refactor tests
Added some docs to the README
Updated readme
Added readme
Fixed the spec tests.  Have run into a problem with the cucumber test for data sources.  In the index we link to the list of export runs for the data source.  Normally this would be an active record relation or nil, but when using FactoryGirl data_source.export_runs is an empty array.  So in the index when we test for "if data_source.export_runs" it will work in the "real" app but not in cucumber.  Not sure what to do about that at this point.