Merge pull request #4 from theptrk/feat/polishUrlEncoded

Feat/polish url encoded
Merge pull request #6 from theptrk/doc/docsForMake

(doc) Intensify documentation.
(feat) Added Cargo Support
Merge pull request #9 from iron/feat/cargo

(feat) Added Cargo support.
Merge branch 'feat/errorHandling' of https://github.com/theptrk/urlencoded into theptrk-feat/errorHandling
Clean up unused variables