Add test cases to 'large struct' test; a patch from @take-cheeze; ref #2052
Restore arena index since large struct may create many Proc objects; a patch from @take-cheeze; ref #2052
remove mirb regression test that fails on travis-ci only
Refactor fix_rev
Merge pull request #2053 from suzukaze/refactor-fix_rev

Refactor fix_rev
khash.h: use first found k_del
disable bintest for now
Refactor fix_lshift
Refactor fix_rshift
Fix indent in bit_coerce
Merge pull request #2056 from suzukaze/fix-indent

Fix indent in bit_coerce
Merge branch 'Refactor-numeric.c' of https://github.com/suzukaze/mruby into suzukaze-Refactor-numeric.c
avoid function style parens after "return"; ref #2055
Merge branch 'master' of github.com:mruby/mruby
add kh_push2() to check if entry is added
use kh_put2 in mrb_hash_set for performance improvement
use quadratic probing in khash.h
disable fragile bintest on travis-ci