increment lib to 0.7 and required refactoring

gradle.properties

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

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

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

src/main/java/gov/usgs/earthquake/nshmp/Hazard2018.java

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

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