More succinct paralleltest test output.
Add APUG slides.
Add accompanying IPython notebook.
Add CSS to use with Notebook slideshow view.
Merge pull request #448 from cowlicks/apug-pr

@bgrant's Austin Python User Group Slides.
Merge pull request #439 from enthought/feature/compact-paralleltest-reporting

More succinct paralleltest test output.
Fixes #461.

Generalizes `Distribution.is_compatible()` to treat 'n' as compatible
with 'b', 'c', and 'n' when it makes sense to do so.
Adds logic to treat degenerate maps as compatible.

Test case added as well.  Now 'b' and 'c' are considered compatible if
they both have `proc_grid_size == 1` and equal `size`s.