Merge pull request #1 from rproepp/master

Fixed segmentation fault on empty spike trains
Initial Travis setup.
Add apt-get numpy/scipy to .travis.yml
Update .travis.yml
Add travis build status to README.md
Implement Travis build with and without spykeutils.
Merge travis config changes made via github's editor.
Move build status badge next to title in README.
Still fiddling with location of Travis build tag.
Clean up package structure for upload to pypi.
Update Travis configuration after moving test script.
Add benchmark script to MANIFEST.in.
Remove useless check for numpy availability in tests.

After all, the package does depend on numpy anyway.
Update README.
Add COPYING to MANIFEST.in.
Add requirements to README.
Update license information.
Use setuptools instead of distutils.
Add more package metadata.
Initial changes to support python 2 and python 3 at the same time.