Don't format the code to go in .pythonrc.py in a doctest

This is way too confusing. You don't put doctests in files, you put code in
files.
Don't make it sound like Jedi has to be installed with pip
Show how to fallback to regular readline completion
Note that you have to add PYTHONSTARTUP to your profile
Indent code blocks in the docstring
Cleanup to the Jedi .pythonrc.py example
Add some print statements to the .pythonrc.py example
Skip doctests that are just completion examples
Merge pull request #289 from asmeurer/pythonrc

Some fixes to the .pythonrc.py code