Update dtopotools notebook to work with newer geometry functionality
Change sratch directory paths
Merge remote-tracking branch 'rjl/dtopotools_notebook' into dtopotools_notebook

Conflicts:
	notebooks/geoclaw/dtopotools_examples.ipynb
	notebooks/geoclaw/topotools_examples.ipynb
Accomodate dZ rename
Preliminary unstructured grid example
Add working unstructured topotools example
Merge remote-tracking branch 'clawpack/master' into dtopotools_notebook

Conflicts:
	notebooks/geoclaw/dtopotools_examples.ipynb
	notebooks/geoclaw/topotools_examples.ipynb
Merge pull request #39 from mandli/dtopotools_notebook

Add Unstructured Topography Example