Amazon s3

I followed Seb's instructions, that is to say:
  - created an S3 bucket called "itsybikini"
  - uploaded a few picture files with the Amazon GUI
  - created a user called "itsy"
  - added a permission to access the bucket to "itsy" user
  - installed figaro, paperclip, aws-sdk gems and installed imagemagick with brew
  - bundled 
  - created a paperclip.rb initializer
  - migrated for paperclip modification
  - modified Pictures
    model,
    controller,
    _form view
    and show view