Capability to use arbitrary Runge-Kutta methods in SharpClaw.  Untested.
Arbitrary Runge-Kutta methods working in SharpClaw.
Spatial splitting with embedded RK methods.
switch mask logic

1 is use b method, 0 is use b_hat
Add Shu-Osher shock-sine nteraction problem.
Convert NaNs to zeros.
Fix bug in running tests when petsc4py is not available.
Fix bug in ascii.py.
More careful exception handling in ascii.py.
Merge pull request #265 from ketch/import_bugfix

Fix bug in running tests when petsc4py is not available.
Clean up io/petsc.py.
Merge pull request #268 from ketch/clean_up_io

Clean up I/O
Revise landing page for docs.
Merge pull request #269 from ketch/docs_quickstart

Revise landing page for docs.
Eliminate repetitive property code by overriding __getattr__.
Doc updates.
Merge pull request #271 from ketch/geometry

Doc updates.
ENH: riemann_compare module

New module for comparing various implementations of Riemann solvers.
added riemann shootout framework
iso_c variant