Merge pull request #18 from ssx/new_feature

Adding overview model and update collection command to populate new model
Merge pull request #19 from ssx/new_feature

Make Overview API use new overview table for results
Merge pull request #20 from ssx/new_feature

Changing overview ordering to be most free spaces first
Sample data file is now a tar.gz archive which removes the need for unzip, fixes #7
Merge pull request #21 from ssx/bugfix_7

Sample data file is now a tar.gz archive, fixes #7