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.
deleted PKGBUILD file
actually removed the PKGBUILD file
(previous just moved into new folder)
Add missing files to source distribution: README, *.cmake
Merge branch 'master' into fix-setup26