improved docs on testing
fixed gallery/make_plots.py to look for 'all:' in Makefile and if found do 'make all' since make_all.sh files were removed from geoclaw directories where 'make topo' is required.  Need to clean this up, perhaps add default all target to Makefile.common?
bumped version to 5.0.0
improved script to make gallery plots
adjusted index.html
misc changes to docs
improved description of user routines and added pages on library defaults for commonly changed routines
updated release notes
changed pointer to landing page
added link to registration page
tweaks to gallery
license year
add link to classic example
added page on IPython notebooks
added notebooks.rst
Merge pull request #47 from rjleveque/5.0.0-updates

5.0.0 updates
Flesh out the notebooks page a little more.
Merge pull request #48 from ketch/notebooks

Flesh out the notebooks page a little more.