Convert Hash keys to String. (Fixes #259)
Convert Hash keys to String. (Fixes #259)

This is needed for Ruby 1.8.7 compatibility.

sdgdsffdsfff/guard,ginkel/guard,baberthal/guard,100star/guard,sideci-sample/sideci-sample-guard,garettarrowood/guard,yujinakayama/guard,guard/guard,pjump/guard