Merge pull request #12 from archSeer/rb-fix

Don't compile rb files to mrb.
Fixes about VS toolchain
Check /build/
Check authors is 'mruby developers' whether the gem should be shared module or not.
Extension misconception is corrected.
Merge pull request #13 from click3/master

Extension misconception is corrected.
Fixes build
reject!
Fixes build
Cleanup code
Solved loading of filens on different volumes on windows
Remove tailing whitespaces
Use mrb_module_get
Remove the offending code to make mruby-require work.

This removes the gem require functionality, but we don't really
care, as all we need is file loading.
Replace fopen exists checks with stat(). It's faster.
Remove the MRUBY_REQUIRE env feature.
Don't compile rb files to mrb.

This enables us to have proper backtraces, so when we debug it
actually makes sense.
Fix extension handling for relative paths.

If the path or the filename started with a ".", then it treated
the whole string as one long extension ("./core/test") instead
of realizing there's no extension.
Add current directory to load path.