- Updated to 2.0b8
    - License switched upstream to ASL 2.0 since 2.0b4
    - Remove specifications for obsolete Fedora versions
    - Remove python_sitelib definition
    - URL and Source0 URL revised
    - BuildRoot tag removed
    - BR: tkinter removed, PyYAML added
    - Requires: tkinter removed
    - nltk-0.9.2-use-sys-yaml.patch removed
    - All redundant commands in 'install' section removed
    - nltk_contrib entry in 'file' section was removed since it will include no
        file. Upstream split off a new tarball for nltk-contrib.