stemmer 0.3.0

Stemming library for Rust, using bindings to Snowball C implementation
Documentation
ChangeLog
=========

0.3.0 (???)
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* `stem` now takes `&mut self` instead of `&self`
* `stem_unsafe` renamed to `stem_str` since it is no more unsafe:
  borrowchecker can verify that `stem` is not run again while there is
  a reference to the returned `&str`
* added more tests

0.2.0 (2015-08-09)
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* Completed the documentation
* Only compile `test.rs` when `cargo test` is runned
* Removed unnecessary use of `#[repr(packed)]
* Changed signature of `stem_unsafe`, which is now actually safe to
  call but returns an unsafe to use pointer 

0.1.1 (2015-06-23)
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* Removed a silly `println`

0.1.0 (2015-06-23)
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* Initial release