too much peephole optimization; close #1992
Merge branch 'master' of github.com:mruby/mruby
test fails when we don't have Enumerator.
Merge pull request #1993 from iij/pr-array-should-not-depend-on-enumerator

test fails when we don't have Enumerator.
Support :T_FIBER in ObjectSpace.count_objects .
Merge pull request #1996 from take-cheeze/objectspace

Support :T_FIBER in ObjectSpace.count_objects .
Fix build fail for 'make test' with no mrbgems
Merge pull request #1997 from kyab/fix-make_test-fail-without-gems

Fix build fail for 'make test' with no mrbgems
downto, upto, step to return Enumerator
add assertion before casting
delete khash member upper_bound
Merge pull request #1998 from ksss/khash-delete-upper_bound

delete khash member upper_bound
Merge branch 'master' of github.com:mruby/mruby
space adjustment in khash.h
add --help option to mruby-config
should not access proc->body.irep if proc is PROC_CFUNC; close #1999
Merge pull request #2000 from kyab/add-help-for-mruby-config

add --help option to mruby-config