wong gmm update sync

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

...ain/java/gov/usgs/earthquake/nshmp/gmm/WongEtAl_2015.java

src/main/resources/gmm/coeffs/Wong15-1080.csv

src/main/resources/gmm/coeffs/Wong15-150.csv

src/main/resources/gmm/coeffs/Wong15-1500.csv

src/main/resources/gmm/coeffs/Wong15-185.csv

src/main/resources/gmm/coeffs/Wong15-260.csv

src/main/resources/gmm/coeffs/Wong15-365.csv

src/main/resources/gmm/coeffs/Wong15-428.csv

src/main/resources/gmm/coeffs/Wong15-530.csv

src/main/resources/gmm/coeffs/Wong15-760.csv

src/main/resources/gmm/coeffs/Wong15.csv