Updated CHANGELOG for 0.26.1-rc3 release.
Updated CHANGELOG for 0.26.1-rc3 release.

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