Update README to mention `pudb` script
Mention pull requests
Merge pull request #60 from asmeurer/readme

Small updates to the README
Allow saving the current traceback to a text file.
Don't crash when on '.' and ',' with no last search. Fixes #62.
Add support for __version__. (suggested by Luke Lee)
Add .mailmap

Now git shortlog -ns has no duplicates. Also, I wanted an excuse to exercise
my push access :)
Add .DS_Store to .gitignore