Add Ian Downes to contributors.
Add Ian Downes to contributors.

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