Updated the style guide with escape rules for IDs.
Updated the style guide with escape rules for IDs.

Review: https://reviews.apache.org/r/57789

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