Fix document. (Use minirake instead of make.)

Add Makefile for backward compatibility of shell build processes.

Modify String#bytes.

It should return non-negative integer.

Slightly faster Array#each method.

MSVC: include float header for _isnan and _finite

fix memory leak in function: make_cdump_irep

Derive DISABLE_GEMS macro according to build configuration

refactoring src/dump.c

add AR, YACC flags.

fix build

GEMS.active support relative path

minirake exit status not 0, when build failed.

fix (-T, --tasks) show tasks

Use CRuby for building

MSVC doesn't define strtoll

Fix a typo in comment

Added minirake what's Rake subset