Merge branch 'release/0.6.0' into develop
Removes flatblock from cache on deletion. Closes #14
Blocks can now act as templates to be evaluated on the parent template's context
Changes default CSS classes for fields

The original classes ("title" and "content") used within the default
template to render a flatblock's properties clashed too easily with
widely used class names. The new class names used are
"flatblock-title" and "flatblock-content".
Code should now mostly follow PEP8 (using Flake8) and tox-integration
Removed buildout support and moved to distutils
Added toxinidir to PYTHONPATH.
Preparing for 0.7.0
Merge branch 'develop'