Doc updates.
Merge pull request #271 from ketch/geometry

Doc updates.
Update README and docs.
Merge pull request #272 from ketch/readme_quickstart

Update README and docs.
Add quadrants example (2D Euler).
Make quick Domain setup use distinct Dimension names.
Merge pull request #273 from ketch/quadrants_example

Add quadrants example (2D Euler).
Merge pull request #274 from ketch/fix_domain_bug

Make quick Domain setup use distinct Dimension names.
Several small improvements in ascii.py.
Merge pull request #275 from ketch/clean_up_io

Several small improvements in ascii.py.
Use .rst for the gallery.
Stuff.
Partially working gallery construction.