Supported 'plain' char.
Note: char, signed char, and unsigned char are three different types.
Replaced `const [un]signed long long int&` with `[un]signed long long int` in sevral function's arguments to unify the interface. No performance issue is observed.
Fix up README, include accurate instructions
Fixed size types based on snej's pull request.
https://github.com/snej/msgpack-c/commit/1784e7a3f3d012e1149adc9b8a3abb3646eb616f
Merge pull request #36 from redboltz/support_plain_char

Supported 'plain' char.
Merge pull request #46 from redboltz/fixed_size_type

Fixed size types based on snej's pull request.
version 0.5.8
Merge pull request #47 from nobu-k/version-0.5.8

version 0.5.8
Fixed some URL syntaxes
Merge branch 'claws/readme_overhaul'