Verify existence before creating entries on seeds

- Use first_or_create to avoid duplicated entries when executing seeds.rb more than once.
Merge pull request #45 from trein/patch-1

Verify existence before creating entries on seeds
Update rake.
Add checks and workaround for multipart emails. Fixes #47
Merge branch 'master' of github.com:ivaldi/brimir
Update gems, ignore coverage dir.
Fix incorrect test.
Switch to unmodified foundation_rails_helper.
Add Devise secret key.
Fix paperclip attachment content type filters for new paperclip version.
Correctly store message_id after delivering a reply mail.
Added contributing and feature requests to README
Add cancan.
Add show ticket test. Add I18n config change.
Merge branch 'master' of github.com:ivaldi/brimir
Update copyright notice
Fix wrong year in copyright.
Fix double labels in devise forms (due to rails_foundation_helper change).
First steps adding the ability to login as a customer.
Downgrade foundation to make reveal work again.