Nensbuild

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- Check earlier for sysegg installation.

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- Add sysegg check. This depends on the new syseggrecipe.
- Drop python2.6 support (again). subprocess.check_output is nw in python 2.7.

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- Add travis-ci support.
- Use bash as shell for running buildout. Fixes an issue with running nensbuild
on a Vagrant virtual box. Fixes gh-1.

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- Fix classifiers for release on pypi.

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- Remove use of external python libraries.
- Add unittests.
- Initial project structure created with nensskel 1.29.