Making results table more friendly

Per #18, the Sizer-Soze results are a little more reader-friendly. Bytes are converted to KB and MB, where appropriate (and yeah, it *is* sad that MB are often appropriate) and more readable headers are on the table.

I also added a column for total savings as a percentage, for people who want an "at-a-glance" sort of perspective.

@wilto—You can find an example of the generated HTML at https://gist.github.com/tkadlec/9356892. I didn't do anything fancy at all there—figure we can adjust that.