don't use static class instances
Merge branch 'master' of https://github.com/mruby/mruby
Merge branch 'master' of https://github.com/mruby/mruby
Merge branch 'master' of https://github.com/mruby/mruby
Make conf.bins work for cross compiled deps as well as the host.
Merge branch 'master' of https://github.com/mruby/mruby
Test ruby library should depend on host's mrbc, not its own mrbc
Merge pull request #717 from xxuejie/master

Host's mrbc file should be used when cross-compiling mrbtest.c
Merge pull request #716 from carsonmcdonald/crossdepfix

Make conf.bins work for cross compiled deps as well as the host.
remove compiler warnings.
Merge pull request #718 from mattn/remove_compiler_warnings

Remove compiler warnings