reverse-i-search enhancement request

[omgwtf]

Sometimes when I want to distinguish between commands in the history
what differs them or makes them special is far from each other in the
command making reverse-i-search function very bad. Since I have to type
everything in between exactly, because it hits only on the full string.

example:
. ~/virtualenv/py26/bin/activate; ~/projects/project/manage.py runserver

Relevant parts: "py26" and "project"
        
Solution:
Let spaces in reverse-i-search hit individually.

It can work like this, where the bold text represents hits from the
reverse-i-search.

http://i56.tinypic.com/2klcv8.png

I think this functionality could be something people expect since for
example search engines work this way.