Move env specific config into production.rb

Having conditional paperclip attachments doesn't really work. Paperclip
supports default configuration though so this takes advantage of that in
production.rb and removes the ability to configure paperclip in
development and test as you really shouldn't be using S3 in
either environment.
Merge pull request #313 from opscode/paperclip_config

Move env specific config into production.rb
Use correct data for cookbook version show.

The controller action CookbookVersion#show was using temporary data and was not
updated with the Cookbook#show to use the actual owner and collaborator data.
This changes that.
Merge pull request #325 from opscode/cookbook_version_show_ownership

Use correct data for cookbook version show.
owners shouldn't be able to add themselves as collaborators
style the button consistently
add name to collaborator
find users by username
Formats the add collaborator input field
Override some default select2 styles and convert to rem-calc for RWD.
find users by username, for reals this time