bump version to 0.0.52
bump version to 0.0.52

gbenoit79/elastalert,kkoppel/elastalert,AlphaStaxLLC/elastalert,ltagliamonte/elastalert,amoennin/elastalert,dvopsway/elastalert,rounds/elastalert,rarescosma/elastalert,mash0304/elastalert,lytics/elastalert,saltukalakus/elastalert,jetyang2005/elastalert,jetyang2005/elastalert,iamrudra/elastalert,rprabhat/elastalert,jetyang2005/elastalert,brianparry/elastalert,thomdixon/elastalert,megancarney/elastalert,Yelp/elastalert,saltukalakus/elastalert