Reword mention of mrbtest in README
should be able to create hash with 127+ entries; close #1894
add Hash#each_pair
Merge branch 'master' of github.com:mruby/mruby
Merge pull request #1899 from stomar/about

Reword mention of mrbtest in README
use File#directory? instead of File#exist?; ref c2d8b0
Merge branch 'master' of github.com:mruby/mruby
reduce hash creation by using update method
Fix behavior of Comparable methods
when <=> return nil
Add Enumerable#{flat_map,collect_concat}
Merge pull request #1901 from ksss/compar-other

Fix behavior of Comparable methods when <=> return nil
Merge pull request #1902 from suzukaze/add-enum-flat_map

Add Enumerable#{flat_map, collect_concat}
flat_map to support multiple values; ref #1902
Prevent accepting String value for mrb_get_args("i")

Accepting String value for mrb_get_args("i")
causes unintentional expression.

  * `"str" * "3"` => `"strstrstr"`

This change prevents String->Integer conversion for mrb_get_args("i")
and fixes above problem.

See also:
https://github.com/mruby/mruby/issues/1903
reduce object allocation in __update
implement Fiber#transfer
make Fiber#transfer compatible with CRuby
Merge pull request #1904 from ktaobo/get-arg-int

Prevent accepting String value for mrb_get_args("i")
Merge branch 'master' of github.com:mruby/mruby
Merge pull request #1900 from take-cheeze/fiber_transfer

Implement Fiber#transfer.