Add parallelization using parallel gem. Using in_threads to keep global data.

Before: 128 seconds bare.
After: 39 seconds bare.

Not a *huge* increase but it is for another feature I’m working on.
Add volume information.
Fix caching error.
Was printing the array instead of comma separated string like new_volumes resulting in throwing out the “cache” every second run.
Ignore All the data files!
Add disk usage script.
Update ReadMe
Merge pull request #2 from Chealion/parallel

Parallel