add assert_{includes,instance_of,kind_of,raises} methods.
Fix errors caused by stdio.h dependent code.
Support to build on pwd != mruby source root
Reduce sprintf() calls. Remove mrb_int_to_str() and MRB_INT_FORMAT.
Remove commented out code. Remove redundant function calls.
Merge pull request #876 from masuidrive/fixed_build_system

Support to build on pwd != mruby source root
Merge pull request #879 from monaka/pr-remove-redundant-funcalls

Remove commented out code. Remove redundant function calls.
Merge pull request #875 from monaka/pr-enable-building-libmruby-with-DISABLE_STDIO-macro

Fix errors caused by stdio.h dependent code.
Merge pull request #878 from monaka/pr-reduce-sprintf

Reduce sprintf() calls. Remove mrb_int_to_str() and MRB_INT_FORMAT.
Make OP_ASGN faster.

I think that `*=` and `/=` can be compiled to `OP_MUL` and `OP_DIV`.
add chipKitMax32 target example
remove user specific directory
Adjust stack position of NODE_RESCUE.
Add more tests for `begin` and `rescue`.
Merge pull request #883 from masamitsu-murase/modify_node_rescue_handling

Adjust stack position of NODE_RESCUE.
Merge branch 'pr-mrbtest-assert-ext' of https://github.com/iij/mruby into iij-pr-mrbtest-assert-ext
rename assert_includes to assert_include
remove assert_instance_of and assert_kind_of which might hinder duck typing
rename assert_raises to assert_raise
Merge pull request #882 from bovi/chipkit

chipKitMax32 target example