optional csv logging to get rid of strict Cassandra dependency

@airbnb/di 
Added optional job status logging to remove strict Cassandra dependency.
Agree. I did some search on this too. It seems like map binding might be a better solution. https://github.com/google/guice/wiki/Multibindings and 
http://stackoverflow.com/questions/7663618/guice-runtime-injection-binding-at-command-line
However, it seems not available in our current version of Guice.