Modify style to limit line length to 80 characters

I'm not even going to try and frame this pull request as particularly serious. I put it together when I had a couple of files open side-by-side in a split vim window and didn't like the line wrapping. If you don't like the style or prefer not to make style changes in general I will take zero offense at the pull request being closed without merging.

1928 IBM punchcards had 80 columns, largely due to the punchcards having been designed (in the late 1880s) to be the same size as currency so as to be able to carry them around in currency carriers. It is obvious therefore, for these reasons, that we should today try and write code that has no more than 80 characters per line.

This commit modifies the provider ruby code to conform to the horizontal width of a late 1880s currency carrier, were the ruby code to be printed monospace in an appropriate font size.