Some changes per Tufte seminar.

- Resources per row, rather than column.
- Added column with histograms of all summaries.
define after_clean hook to allow additional cleanup.

Previously example.makeflow remained after running the test suite.
align output of test suite with longer filenames
remove directory previously missed by sand test cleanup
use variable to delete makeflow file in test suite
Merge pull request #174 from rampantmonkey/test_cleanup

Test cleanup
Merge pull request #170 from btovar/et-changes

Some changes per Tufte seminar.