Added support for blacklists for authors and paths

[Monnoroch]

fix #25 fix #24

[Monnoroch]

I actually have tested it, it outputs the same results for default config, and successfully filters all stats (at least in my case).

[dehru]

Hey monnoroch, I'm trying to use your fork. I'm getting this error:

Traceback (most recent call last):
  File "/Users/cromed/workspace/forked-gitstats/gitstats/gitstats", line 1511, in <module>
    g.run(sys.argv[1:])
  File "/Users/cromed/workspace/forked-gitstats/gitstats/gitstats", line 1486, in run
    data.collect(gitpath)
  File "/Users/cromed/workspace/forked-gitstats/gitstats/gitstats", line 450, in collect
    time, rev, author = revline.split(' ')
ValueError: too many values to unpack

Any ideas?

[Monnoroch]

Sorry, but I have no memory of sending this PR :)