Public API changes to increase familiarity

[brycx]

Implements #106.

[codecov]

Codecov Report

Merging #107 into master will increase coverage by 0.11%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #107      +/-   ##
==========================================
+ Coverage   97.39%   97.51%   +0.11%     
==========================================
  Files          47       47              
  Lines        6152     6150       -2     
==========================================
+ Hits         5992     5997       +5     
+ Misses        160      153       -7

Impacted Files	Coverage Δ
src/hazardous/aead/streaming.rs	98.23% <100%> (ø)	⬆️
src/hazardous/mac/hmac.rs	93.42% <100%> (-0.17%)	⬇️
src/hazardous/hash/blake2b.rs	93.18% <100%> (ø)	⬆️
src/kdf.rs	100% <100%> (+2.85%)	⬆️
src/auth.rs	100% <100%> (ø)	⬆️
src/hazardous/mac/poly1305.rs	94.67% <100%> (ø)	⬆️
src/typedefs.rs	96.32% <100%> (ø)	⬆️
tests/mac/mod.rs	100% <100%> (ø)	⬆️
tests/hash/mod.rs	100% <100%> (ø)	⬆️
src/hazardous/hash/sha512.rs	96.25% <100%> (ø)	⬆️
... and 7 more

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