Add ERM-N and ERM-S fault sources.

.../fault/TN/Eastern Rift Margin (North)/1-eq/rate-tree.json

...ault/TN/Eastern Rift Margin (North)/1-eq/rupture-set.json

...fault/TN/Eastern Rift Margin (North)/2-eqs/rate-tree.json

...ult/TN/Eastern Rift Margin (North)/2-eqs/rupture-set.json

stable-crust/fault/TN/Eastern Rift Margin (North)/README.md

...Margin (North)/features/eastern-rift-margin-north.geojson

...e-crust/fault/TN/Eastern Rift Margin (North)/mfd-map.json

...ust/fault/TN/Eastern Rift Margin (North)/source-tree.json

...crust/fault/TN/Eastern Rift Margin (North)/tree-info.json

stable-crust/fault/TN/Eastern Rift Margin (South)/README.md

...rn Rift Margin (South)/crittenden-co/2-eqs/rate-tree.json

... Rift Margin (South)/crittenden-co/2-eqs/rupture-set.json

...rn Rift Margin (South)/crittenden-co/3-eqs/rate-tree.json

... Rift Margin (South)/crittenden-co/3-eqs/rupture-set.json

...rn Rift Margin (South)/crittenden-co/4-eqs/rate-tree.json

... Rift Margin (South)/crittenden-co/4-eqs/rupture-set.json

...astern Rift Margin (South)/crittenden-co/source-tree.json

...rn Rift Margin (South)/features/crittenden-county.geojson

...uth)/features/eastern-rift-margin-south-extension.geojson

...Margin (South)/features/eastern-rift-margin-south.geojson