v0.8.0

Added

• Add Token::as_str() and as_str() to other token and property types.
  as_str() replaces to_str() or as_str_unchecked() as the preferred method
  to get the underlying value.
• Add Token::from_str() and from_str() to other token and property types.
  The method should be used for constructing values in tests.

Deprecated

• Deprecated as_str_unchecked(), to_str() and into_inner() on Token.
• Deprecated as_str_unchecked(), to_str() and into_inner() on token types.
• Deprecated as_str_unchecked() and to_str() on property types.

Removed

• Remove From<&[u8]> and AsRef<[u8]> implementations from token and property
  types.

Changed

• Changed the internal implementation of tokens to use &str instead of
  &[u8]. Micro benchmark performance should be similar to the previous
  implementation, but when using as_str() instead of to_str(), the calling
  code does not have to handle a Result type which should increase overall
  performance.