gemspec bumped up to newer hashie version
allow hashie versions 2.x
Remove Rash dependency

Hashie duplicated the functionality of Rash in version 2.1.0. Using both
gems together causes a namespace collision. For more details see:
https://github.com/tcocca/rash/issues/9
Merge pull request #38 from caseylang/remove_rash

Remove Rash