Merge pull request #2 from mhearne-usgs/master

Notebook addition, mostly.
Merge pull request #3 from mhearne-usgs/master

Added normality tests, filtered depth to notebook
Merge pull request #4 from mhearne-usgs/master

Fixed some errors in notebook, added some code to it
Merge pull request #5 from mhearne-usgs/master

Updated readme with dependency documentation
Merge pull request #6 from mhearne-usgs/master

Added distance and azimuth to geteventsincircle function
Added read for strike and dip grids to notebook; added ellipse search and heading functions to utils.
Merge pull request #7 from ghayes-usgs/master

Added read for strike and dip grids to notebook; added ellipse search an...
Added plotting of points to notebook