Stop hardcoding python2.6.

You may also want to update the submodules.  I had to get git://github.com/davepacheco/javascriptlint@e1bd0abfd424811af469d1ece3af131d95443924 to compile cleanly on Ubuntu 12.04 and 13.04.

- Dimitri
Merge pull request #1 from aglarond/patch-1

Stop hardcoding python2.6.