Added support for NLTK-style segmentations.
Removed setup attributes missing in Python 3.
Removed Python 3.x issues and implemented functionality to obtain the list of coders for datasets and dicts.
Removed assertAlmostEquals delta keyword usage to support Python 2.6.
Removed usage of collections.Counter to support Python 2.6.
Expanded the list of tested Python versions.
Removed Python 3.2 and 3.3 from allowed failures.
Corrected testes for Python 2.6.