Simplify path helpers

[dummied]

A few examples:

https://github.com/SherSpock/muscle-wizards/blob/master/app/controllers/conversations_controller.rb#L12

prep_conversation_messages_path(@prep, @conversation)

https://github.com/SherSpock/muscle-wizards/blob/master/app/controllers/preps_controller.rb#L14

redirect_to @prep

Reasonably sure there are more in there (haven't looked at views yet, for instance)

[dummied]

https://github.com/SherSpock/muscle-wizards/blob/master/app/controllers/target_cardios_controller.rb#L19

redirect_to @prep

[dummied]

https://github.com/SherSpock/muscle-wizards/blob/master/app/controllers/certifications_controller.rb#L13 https://github.com/SherSpock/muscle-wizards/blob/master/app/controllers/certifications_controller.rb#L27 https://github.com/SherSpock/muscle-wizards/blob/master/app/controllers/certifications_controller.rb#L36

redirect_to current_user

[sbaughman]

fixed with debug branch