updates for fault processing

src/main/java/gov/usgs/earthquake/nshmp/Faults.java

src/main/java/gov/usgs/earthquake/nshmp/gmm/GmmInput.java

src/main/java/gov/usgs/earthquake/nshmp/mfd/Mfd.java

...ain/java/gov/usgs/earthquake/nshmp/model/Deserialize.java

...java/gov/usgs/earthquake/nshmp/model/FaultRuptureSet.java

...ain/java/gov/usgs/earthquake/nshmp/model/FaultSource.java

...main/java/gov/usgs/earthquake/nshmp/model/GridLoader.java

...ain/java/gov/usgs/earthquake/nshmp/model/HazardModel.java

src/main/java/gov/usgs/earthquake/nshmp/model/MfdTrees.java

...ain/java/gov/usgs/earthquake/nshmp/model/ModelLoader.java

...n/java/gov/usgs/earthquake/nshmp/model/SourceFeature.java

src/test/java/gov/usgs/earthquake/nshmp/mfd/MfdTests.java