Deleted all code references to nani.
Made NANI_TABLE_NAME_SEPARATOR obsolete (will display a deprecation warning).
Nani still survives in CSS classes of admin templates.
Removed dead code.
Update documentation and metadata, making way for work on next release
Merge pull request #176 from spectras/v0.5cleanup

Codebase spring cleanup, getting ready for work on new features for v0.5.
Removed _real_manager and _fallback_manager indirections as they were confusing and served no real purpose.
Made all 3 querysets used by TranslationManager customizable (translated, untranslated, default)
Reworked TranslationQueryset so its constructor takes the standard arguments again.