Fix attributes name in rake db:seed:add-users
Merge pull request #596 from paulopatto/bugfix_seed_add_users

Fix attributes name in rake db:seed:add-users
created migrations to add some timestamps missing in past projects
Merge pull request #597 from diogob/fix_missing_project_dates

created migrations to add some timestamps missing in past projects
contact_email => email_contact
fixed duplicated email in AR taken message [fix #590]