Senior Developer LS Challenge Pull Request

A pull request for the Senior Developer Challenge.

I met an engineer at LivingSocial at a recent conference in Buffalo, NY. After discussing with here, I was more interested in a Front-end position - but I do have 4 years of experience as a full stack developer. I am not a current ruby-ist so please excuse my submission for being built in Sinatra for the backend handling of the file uploads.

After this pull request, I am going to see if I can hack around it some more to make it more efficient and possibly use more threads for the file processing.