For some reason jeremy is referenced in the install path:
$ gem install mail_view
ERROR: While executing gem ... (Gem::Package::PathError)
installing into parent path /Users/jeremy/work/plugins/mail_view/Gemfile
of /Users/nathany/.gem/ruby/2.0.0/gems/mail_view-2.0.2 is not allowed
For some reason jeremy is referenced in the install path:
I currently have mail_view 2.0.1 installed.