Add tests for the stats analyzer.
Add import stats summary.
Add local references to the summary.
Order stats by remotes and number of occurrences.

Use tabwriter to format the text.
Merge branch 'master' into import_stats

* master:
  add --dependency-tree to show dependencies and versions

Conflicts:
	main.go
Merge pull request #31 from calavera/import_stats

Add import stats summary