Remove multiple definition of RuntimeError.
Use MRB_DUMP_OK instead of 0.
include/mruby/cdump.h: Add new error codes.
src/cdump.h: Use error codes defined in mruby/cdump.h.
silence clang warning
use the new specifier b instead of o
Merge pull request #736 from selman/cmake_warning_fix

silence clang warning
Merge pull request #734 from monaka/pr-error-check-inprovement-in-cdump-and-dump

Error check inprovements in cdump and dump
Merge pull request #732 from masamitsu-murase/remove_multiple_definition_of_RuntimeError

Remove multiple definition of RuntimeError.
wrong condiiton in too many symbols check; #close #731
Merge branch 'master' of github.com:mruby/mruby
supress cast warning on C++.
Fix disappearance of command_call in case of statement without parentheses.
mrb_field_write_barrier paints also gray in the major collector.
These objects will be traversed after a minor collect cycle.
check if array shrinks in each block
check if array expands in each block
save/restore arena index in mirb; close #740
Merge pull request #744 from authorNari/fixed-field-write-barrier

mrb_field_write_barrier paints also gray in the major collector.
Merge pull request #739 from cremno/use-b-specifier

Use new mrb_get_args binary specifier.
Merge pull request #742 from mattn/supress_cast_warnings

supress cast warning on C++.
Merge pull request #743 from iij/pr-fix-masgn

Fix disappearance of command_call in case of statement without parentheses