update usgs
update usgs notebook
remove un-needed cell
fix units
fix progress bar
fix merge issue
fix req file issues
Re-factored loop.
Merge pull request #1 from ocefpaf/update_usgs_pandas

Update usgs pandas
update comments
add python file and rerun notebook with restarted kernal
Merge pull request #177 from birdage/update_usgs

Theme 2 Scenario 2A, Update usgs notebook
update inline documentation
update inline documentation