New mrb format. The detail is in https://github.com/mruby/mruby/issues/944
Change unsigned char to uint8_t
Fixed to uint8_t
Don't initialize variables that store result as MRB_DUMP_OK. It possibly causes bugs on modifications in the future.
Remove unused substitutions and calculations.
Use type cast not void* but char*. Don't substiture void pointers.
Store to *bin_size if bin_size != NULL.
Clean up code.
Sanity check. As there are implicaton SIZE_MAX >= UINT32_MAX in this code. This assumption may break on some targets which have 16bit memory space.
Don't use int. It decreases portability.   Use size_t as array index and length. It avoids overflow in the extreme situations.
Fix warnings.
Merge pull request #1 from monaka/pr-new-mrb_format

Patches to new_mrb_format
Refactoring mruby-rand
Use C99 flexible array in pool.c
Merge pull request #1075 from mattn/refactoring_rand

Refactoring mruby-random
Merge pull request #1076 from kano4/pr-use-c99-flexible-array-in-pool_c

Use C99 flexible array in pool.c
resolve conflict from #964
Support mt instance valiables
Activated mruby-random
Merge pull request #1077 from matsumoto-r/support_mt_instance_val

Support MT instance valiables and activate mruby-random