Bumping cassandra to version 1.2.13 for TravisCI
Bumping cassandra to version 1.2.13 for TravisCI

jfederico/Hilary,stuartf/Hilary,mrvisser/Hilary,timdegroote/Hilary,Orodan/Hilary,simong/Hilary,nicolaasmatthijs/Hilary,Orodan/Hilary,simong/Hilary,ExC0d3/Hilary,timdegroote/Hilary,stuartf/Hilary,jfederico/Hilary,nicolaasmatthijs/Hilary,ExC0d3/Hilary,mrvisser/Hilary