Fix potential bug about Hash.
Restore arena in `String#split`.
removed declarations of undefined functions
Merge pull request #820 from cremno/unused-stuff

Remove declarations of undefined functions
Merge pull request #817 from masamitsu-murase/restore_arena_in_string_split

Restore arena in `String#split`.
Merge pull request #816 from masamitsu-murase/modify_potential_error_of_hash

Fix potential bug about Hash.
Merge pull request #815 from masamitsu-murase/modify_handling_of_large_fixnum

Modify handling of large fixnum
Merge pull request #812 from shtirlic/androideabi

Add androideabi toolchain rake task (Build mruby with Android NDK)
Merge pull request #813 from masuidrive/generate_mrbtest_a

Generate mrbtest.a file for sparete from driver.o
rewrote mrb_any_to_s

use %p instead of %lx to prevent truncation and for consistency
Merge pull request #823 from cremno/mrb_any_to_s-rewrite

mrb_any_to_s rewrite
Add semi-colon after the statement.
Merge pull request #824 from monaka/pr-add-semicolon

Add semi-colon after the statement.
changing Make_Data_Struct API; you need to modify your code that uses Make_Data_Struct; close #821
Change task rule based on build_dir so main rules don't clobber gem rules.
Ignore empty gem
Merge pull request #828 from mattn/ignore_empty_gem

Ignore empty gems
Merge pull request #825 from carsonmcdonald/gembuildfix

Change task rule based on build_dir so main rules don't clobber gem rules
Fix incorrect index use. nerr was being used for warning buffer check.
Merge pull request #830 from carsonmcdonald/warncheckfix

Fix incorrect index use. nerr was being used for warning buffer check.