Merge branch 'master' of git://github.com/clawpack/pyclaw

* 'master' of git://github.com/clawpack/pyclaw:
  correct the verifier returned tuple
  Fix gauges coordinates
  modification for testing gauges
Fix bug in running tests when petsc4py is not available.
Merge branch 'master' of git://github.com/clawpack/pyclaw

* 'master' of git://github.com/clawpack/pyclaw:
  Added comments where obscure error message is generated suggesting we fix this
  Don't adjust time step based on an absolute size.
  Fixed ascii.py and binary.py reading of aux arrays
  Added code to read binary aux file to io.binary
  added pyclaw/io/binary.py to read binary amrclaw output
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.
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
fixes #248 (riemann_compare branch)
f2py-based compile flags in Makefile
added 2D shallow water test
don't propagate failed import