Fix mrb_fix2str() to enable handling some negative values correctly. This fix is based on @cremno's hack. It will fix #869.
Cosmetic changes. Just added empty lines.
Remove a comment at an unsuitable place.
Add a comment.
Fix an underlying bug. flodivmod() will be crashed in case ((y == 0) && ((divp == NULL) || (modp == NULL))).
Cleanup shift operations.
Merge pull request #873 from monaka/pr-cleanup-numeric-20130223

Clean numeric.c up.
Merge pull request #872 from monaka/pr-fix-mrb_fix2str

Fix mrb_fix2str().
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.