quick strings

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NOTE: See BurntSushi/memchr#156 for details on the shortcomings of this crate.

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Some string comparison functions in Rust that a faster than the standard library.

Function	Performance(ns)	Relative Performance
str.contains	964.96	1.00x (reference)
quick_strings::contains	344.27	2.80x faster
quick_strings::icontains	475.31
str.starts_with	161.38	1.00x (reference)
quick_strings::starts_with	47.30	3.41x faster
quick_strings::istarts_with	72.61
str.ends_with	165.90	1.00x (reference)
quick_strings::ends_with	72.64	2.28x faster
quick_strings::iends_with	116.24

• All quick_strings functions have the signature fn(haystack: &str, needle: &str) -> bool.
• all i* functions (case-insensitive) require the needle to be ascii only.