ascii 0.2.3

`Ascii` type and related functionality, previously in `std::ascii`.
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This packages includes the Ascii type and related functionality that were removed from the Rust standard library on the 2014-12 reform of the std::ascii module.

Ascii is a wrapper for u8 force the value to be within the ASCII range (0x00 to 0x7F). Vec<Ascii> and [Ascii] are naturally strings of text entirely within the ASCII range.