Merge pull request #1 from cranmer/master

run with target luminosity
add DCB class
make DCB default in fit_withsm, include example to run
Spurious signal test script
Script for checking asymptotics
Script for checking asymptotics
load DCB class in check_asympt
make sure everything is compiled w/ ACLiC
Added peak width/location uncertainty NPs
Added 3 sets of signal param values
modifications for chase