Updated contributors.yaml.
Updated contributors.yaml.

Got my first PR in Mesos!

This closes #172

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