Used tense consistently in 1.0 Changelog.
Used tense consistently in 1.0 Changelog.

Review: https://reviews.apache.org/r/48271/

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