load MRUBY_CONFIG script after 'build_config.rb'
Removed mrbc -C option what's C function dump. and TAB to space
Removed mistake
resolve conflict
remove src/cdump.c to resolve; need make clean
rename mrb_ary_alen to mrb_ary_len; close #781
Merge branch 'master' into iij

Conflicts:
	tools/mrbc/mrbc.c