* add ascii folding support
* Minor change and added Changelog.
* add additional tests
* Add tests for ascii folding (#533)
* first tests for ascii folding
* use a `RawTokenizer` for tokens using punctuation
* add test for all (?) folding, inspired by Lucene
* Simplification of the unit test code
* Implement StopWords Filter
- added example doctest for alphanum_only.rs so that I could
drive my own test of the stopword filter
* Style Cop
* Switch HashSet Hasher to FNV for speed
* Update Change Log
* fix missed location renaming