Add 4-0-0 branch and released 4.0.0.rc gems to Travis CI build
Add 4-0-0 branch and released 4.0.0.rc gems to Travis CI build

undergroundwebdesigns/pg_search,rigoleto/pg_search,mpivaa/pg_search,paultyng/pg_search,mpivaa/pg_search,zvikamenahemi/pg_search,paultyng/pg_search,rigoleto/pg_search,savef/pg_search,savef/pg_search,zvikamenahemi/pg_search,Casecommons/pg_search,undergroundwebdesigns/pg_search,Casecommons/pg_search