cesar/ledger-prototype @ end-to-end

Cesar Rodas cdfc02c81a Improved negative balance		%!s(int64=2) %!d(string=hai) anos
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docs	c26f2d560c Introduced a rev-id	%!s(int64=2) %!d(string=hai) anos
src	cdfc02c81a Improved negative balance	%!s(int64=2) %!d(string=hai) anos
tests	cdfc02c81a Improved negative balance	%!s(int64=2) %!d(string=hai) anos
Cargo.toml	ac164a49e4 Add tests	%!s(int64=2) %!d(string=hai) anos
main.rs	14e39a31d9 Made process() sync and use RwLock (from parking_lot) instead of a Mutex	%!s(int64=2) %!d(string=hai) anos