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>

Fixed typos in usage message for mruby tool.

Assign will break when used in a C++ environment

Typo

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

Please respect the specification of C

make %(foo) work

Fix for Linux

Text corrections.