Added output stream operator for ContentType enum.
Added output stream operator for ContentType enum.

gsantovena/mesos,craimbert/mesos,gsantovena/mesos,zmalik/mesos,gsantovena/mesos,dforsyth/mesos,kaysoky/mesos,dforsyth/mesos,Aman-Jain-14/customizedMesos,verizonlabs/mesos,neilconway/mesos,abudnik/mesos,verizonlabs/mesos,verizonlabs/mesos,craimbert/mesos,chhsia0/mesos,reneploetz/mesos,andschwa/mesos,neilconway/mesos,chhsia0/mesos,zmalik/mesos,reneploetz/mesos,craimbert/mesos,dforsyth/mesos,zmalik/mesos,chhsia0/mesos,dforsyth/mesos,neilconway/mesos,verizonlabs/mesos,asamerh4/mesos,jpeach/mesos,reneploetz/mesos,gsantovena/mesos,asamerh4/mesos,asamerh4/mesos,kaysoky/mesos,Gilbert88/mesos,zmalik/mesos,verizonlabs/mesos,kaysoky/mesos,Gilbert88/mesos,kaysoky/mesos,neilconway/mesos,dforsyth/mesos,zmalik/mesos,kaysoky/mesos,chhsia0/mesos,Gilbert88/mesos,andschwa/mesos,asamerh4/mesos,reneploetz/mesos,kaysoky/mesos,gsantovena/mesos,andschwa/mesos,asamerh4/mesos,zmalik/mesos,abudnik/mesos,kaysoky/mesos,Aman-Jain-14/customizedMesos,reneploetz/mesos,Aman-Jain-14/customizedMesos,jpeach/mesos,Gilbert88/mesos,jpeach/mesos,jpeach/mesos,asamerh4/mesos,Gilbert88/mesos,neilconway/mesos,neilconway/mesos,yuquanshan/customizedMesos,yuquanshan/customizedMesos,Aman-Jain-14/customizedMesos,abudnik/mesos,zmalik/mesos,reneploetz/mesos,craimbert/mesos,craimbert/mesos,Aman-Jain-14/customizedMesos,yuquanshan/customizedMesos,Gilbert88/mesos,craimbert/mesos,abudnik/mesos,gsantovena/mesos,Gilbert88/mesos,neilconway/mesos,andschwa/mesos,gsantovena/mesos,abudnik/mesos,jpeach/mesos,asamerh4/mesos,chhsia0/mesos,reneploetz/mesos,chhsia0/mesos,abudnik/mesos,jpeach/mesos,andschwa/mesos,yuquanshan/customizedMesos,Aman-Jain-14/customizedMesos,yuquanshan/customizedMesos,yuquanshan/customizedMesos,chhsia0/mesos,andschwa/mesos,craimbert/mesos,Aman-Jain-14/customizedMesos,andschwa/mesos,jpeach/mesos,dforsyth/mesos,verizonlabs/mesos,verizonlabs/mesos,abudnik/mesos,yuquanshan/customizedMesos,dforsyth/mesos