Add missing files to source distribution: README, *.cmake
Use setuptools on python26 as well

For some reason it seems to work now?!
Why didn't it before?
Add .travis.yml file for continuous integration

Building the dependencies (MAD-X, numpy) will currently take quite some
time!

NOTE: The tests are incomplete at the moment. This commit is only for
testing the travis integration.
Merge branch 'fix-setup26' into travis-ci