Allow Flash::Runfile to act like native hash.

Just a tip if you like this style. I'm using simple-delegator to delegate directly to the native hash. In this way `Flash::Runfile` responds to all hash methods including `[]`.

This is untested, just wanted to collaborate if you like this style!
Merge pull request #1 from plusjade/patch-1

Allow Flash::Runfile to act like native hash.