quickersort 1.0.1

Fast sorting compatible with stable Rust. Also has (optional) support for efficient and robust sorting of floating point numbers.
Documentation
1.1.0
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 * Switch to a four-heap instead of a two-heap, to improve the cache locality
   on large lists.
 * Fix soundness problems in the heapsort, if the comparison function panics
   while sorting.


1.0.0
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 * Forked from [veddan/rust-introsort], because it didn't run on stable Rust.

[veddan/rust-introsort]: https://github.com/veddan/rust-introsort