detect cyclic-include in Module#include
Add gembox feature
Add gembox which contains all core GEMs
Add gembox which contains all default GEMs
Use gembox for default build
Use gembox for travis build
FIX: Default build should use default GEMs and not all Core GEMs
IMPROVE: Move GemBox to more logical source location
Merge pull request #1217 from skandhas/pr-detect-cyclic-include-in-Moudle#include

detect cyclic-include in Module#include
Merge pull request #1218 from bovi/gembox

GemBox
fix gembox rake tasks to support Ruby 1.8
mrb_str_new_static(): zero copy string creation