Update copyright dates.
Add company filtering

Add a -C option to only look at patches from a specific company.

The options are getting out of control; it would be good to switch to
optparse and add long names for some of them.  Someday.
Get rid of the space-before-paren formatting

Dunno why I ever did it that way.  No functional change.
Add a files-touched report

...useful in combination with -C to see where a specific company is working
within the kernel.
Add percentages to the touched-files report

...oh, and while I'm at it, make that report actually work right so that a
patch touching three driver files only shows up once at the drivers/ level.
Changed README to markdown, fixed typos, adjusted formatting