simple typo in a comment

Remove unnecessary check for size_t < 0

size_t can never be negative since it is an unsigned integer according to standard. Removed to silence warning.
Signed-off-by: Patrick Hogan <pbhogan@gmail.com>

Made text edits to README.md to improve clarity.

fix git commands

#undef DEBUG for compatibility with environments that define DEBUG (like Xcode)

fixed statement alignment

Fixed typos in usage message for mruby tool.

Signed-off-by: Patrick Hogan <pbhogan@gmail.com>

Assign will break when used in a C++ environment

Typo

Updated the English README to fix some minor grammatical and spelling mistakes