update hf radar notebook
update to notebook to show 3 series on one plot
update git ignore
inital commit of the usgs rapid reploy gauges
update map
remove error block
Update README.md
Merge pull request #170 from birdage/hf_radar_currents

Theme2-Scenario 2A - HF radar currents, spin off notebook
Merge pull request #171 from birdage/usgs_notebook

Theme 2 Scenario 2A USGS Rapid deploy gauge notebook
Merge remote-tracking branch 'upstream/master'