Don't use `_.toArray` since it acts carelessly
Don't use `_.toArray` since it acts carelessly

Summary:
As @gabalafou indicated, `_.toArray` calls `_.values` which does not
keep the original keys, thus, does not guarantee any ordering which is
crucial here.

Reviewers: gabalafou

Reviewed By: gabalafou

CC: benvinegar, gabalafou, jenkins

Differential Revision: http://phabricator.local.disqus.net/D9546

disqus/grunt-smartrev,disqus/grunt-smartrev