re-remove vulcan tasks that got added back in by #194
Bump to bundler 1.5.2 which includes parallel fix
Use instance variable instead of const for tar name
Merge pull request #198 from heroku/reremove_vulcan_tasks

Reremove vulcan tasks
Merge pull request #199 from heroku/schneems/bundler-1.5.2

Bump to bundler 1.5.2 which includes parallel fix
Merge remote-tracking branch 'upstream/master'