0.2.0

Added

• Following sum with Hasher & Digest implementations:
  • Unix (UNIX cksum)
  • FNV 32 in several variants: FNV1-32, FNV1a-32 and FNV0-32
  • FNV 64 in several variants: FNV1-64, FNV1a-64 and FNV0-64
• Paper & reference about CRC32, CRC32c, Adler32 and UNIX checksum.

Fixed

• CRC32/CRC32C: Useless NOT operations before/after each block write, replaced by
  a single NOT operation in the finish method (and initialisation to 0xFFFFFFFF).

Changed

• Implementation of unit tests to use private macros module
• Names of checksum structs to follow Rust naming conventions (acronyms as single
  CamelCased word): BSD -> Bsd, CRC32(C) -> Crc32(c), UNIX -> Unix
• Code using bitwise operations to use Rust primitive methods where applicable.
• Structure of the library to nest the crc32 module inside a crc module.