Improved links at containerizer.md.
Improved links at containerizer.md.

Review: https://reviews.apache.org/r/42262/

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