Simplify existing tests splitting out functionality
Add multilayer test
Skip multilayer test for now
Stop saving of failed WIP test
Merge pull request #95 from mandli/test-framework-refactor

Simplify Tests and Add Functionality to `tests` Module
Merge branch 'master' into dtopotools2 -- updates to geoclaw.tests

* master:
  Stop saving of failed WIP test
  Skip multilayer test for now
  Add multilayer test
  Simplify existing tests splitting out functionality
change from pcolor to imshow to speed up animate_dz_colors
various changes to the way path can be specified for reading and writing dtopo files
trying to debug tests/dtopo1 - modified regression_tests.py to use latest dtopotools but not clear why gauges don't agree