Remove unused macro.

OutOfRange() is no longer used.

Fix error handlings for fprintf() and fputs() to file.

Unify and rename duplicated functions (noregexp() and regexp_check()).

Add prefix(mrb) to noregexp() and regexp_check().

add write barrier to env on pop call info poped. #2525

Add a missing space after ",".

Remove discareded NULL checks and use mrb_malloc() instead of mrb_realloc().

remove unused MSVC strtoll fallback

printf: cast variables to the expected type

use MRB_STRINGIZE

It's defined in mruby/version.h which gets included in mruby.h, so it's
safe to use.

%x expects unsigned int and %p expects void *

GCC emits a diagnostic about %p/void* in pedantic mode:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=26542

Remove spaces in end-of-line.

Fix and add test for Numeric#pow behavior.

 * Before

2 ** -1 #=> 0

 * After

2 ** -1 #=> 0.5

Use sizeof() instead of strlen().

Fix build failed on VS2012

Remove a discarded comparison.