ResponseWrapper#== returns false for values that dont respond to env
ResponseWrapper#== requires arg to respond to :env and :body
change hashie gem dep >= 1.2

This is a permissive enough dependency requirement that leaves github
still compatible with other gems that rely on hashie version 1.x, but
allows using hashie 2.0 where possible.
Merge branch 'hashie-12-gem-dep'
Merge branch 'fix-response-wrapper-delegate'