Updated `/frameworks` master HTTP endpoint to use `jsonify`.
Updated `/frameworks` master HTTP endpoint to use `jsonify`.

Review: https://reviews.apache.org/r/43816/

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