Updated CHANGELOG for 0.28.0-rc2.
Updated CHANGELOG for 0.28.0-rc2.

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