Adds in --whitespace option to ignore whitespace changes.
Merge branch 'master' of github.com:oleander/git-fame-rb

* 'master' of github.com:oleander/git-fame-rb:
  Update README.md
  Allow user to exclude paths in the repo, and group lines changed by file type

Conflicts:
	README.md
	bin/git-fame
	lib/git_fame/base.rb
Rename 'percent' field to 'distribution' [close #10]
Bump version, 1.2.0