renamed:    git-changelog -> keybump-git-changelog
renamed:    keybump.py -> keybump. updated setup script.
whitespace.
CHANGES.md added to repo.
small updates to the project readme.
added changelog summary for 2.0.1.
* removed:    keybump-git-changelog
* added more options
    * git tag + commit + push is not done optionally by specifying:
      skip_tag, skip_commit, skip_push respectively
* script fails when there is uncommitted junk in the repo
* refactored quite a bit of the code to make it a bit more OOP
updated changelog with for version 3 release notes.
Merge pull request #1 from gregorynicholas/3.0.0-updates

3.0.0 updates