Minor bug fixes, update to 5.1
Improve get_bathy to check for local unarchived files
Update makefiles
Add Hurricane Karen example
Update New York hurricane examples
Merge pull request #33 from mandli/update-stormsurge-5.1

Update storm surge apps to planned 5.2 release
Fix fgmax interpolate function reference
Merge pull request #34 from mandli/fgmax-interpolate-bug

Fix fgmax interpolate function reference
Add riemann solver animation notebook.
Merge pull request #37 from ketch/riemann_notebook

Add riemann solver animation notebook.
first pass at notebooks/geoclaw/dtopotools_examples.ipynb
updated notebook for dtopotools changes.  animate_dz_colors no longer works.
improved dtopotools_examples.ipynb example to include SIFT model, new animation, improved documentation, etc.
Added a topotools_examples.ipynb notebook
cleaned up reloads
updates to topotools and dtopotools notebooks
Added Okada.ipynb notebook
removed output and fixed Okada.ipynb
modified Okada.ipynb for changes to geometry in geoclaw@8918097a534
updated dtopotools_examples.ipynb, DZ --> dZ