SiteClass to GmmUtils.CeusSiteClass

src/gov/usgs/earthquake/nshmp/gmm/AtkinsonBoore_2006.java

src/gov/usgs/earthquake/nshmp/gmm/Campbell_2003.java

src/gov/usgs/earthquake/nshmp/gmm/FrankelEtAl_1996.java

src/gov/usgs/earthquake/nshmp/gmm/GmmUtils.java

src/gov/usgs/earthquake/nshmp/gmm/GroundMotionTables.java

src/gov/usgs/earthquake/nshmp/gmm/SilvaEtAl_2002.java

src/gov/usgs/earthquake/nshmp/gmm/SiteClass.java

src/gov/usgs/earthquake/nshmp/gmm/SomervilleEtAl_2001.java

src/gov/usgs/earthquake/nshmp/gmm/ToroEtAl_1997.java

...gov/usgs/earthquake/nshmp/gmm/GroundMotionTableTests.java