Start of project

Actually, since each statement basically does the same thing, you can just use a hash that goes from param file -> ```get_client_file``` param, e.g.:
```
mapping = {
  "import_success" => "successful_imports",
  ...
}
```
then do something like:
```
raise "Invalid file" unless mapping.has_key?(params[:file].to_s.downcase)
file_path = get_client_file(mapping[params[:file].to_s.downcase])
...
```
Or something similar.