Add failing spec + fix it

fixed

update changelog
Merge pull request #191 from gregory/coercion_bug

Fixed Coercion bug when included in Trash
Fixed StringifyKeys#stringify_keys! to recursively stringify keys of embedded ::Hash types.
Merge pull request #192 from dblock/stringify-keys-recursively

Fixed StringifyKeys#stringify_keys! to recursively stringify keys of embedded ::Hash types.
Fixed stack overflow when coercing mashes that contain ActiveSupport::HashWithIndifferentAccess values.
Fixed link to issue #166.
Preparing for release, 3.2.0.
Preparing for next development iteration, 3.2.1.
this file dont exist :)
Merge pull request #193 from gregory/rm_unused_code

this file dont exist :)
Added Mash#load with YAML file support.
dont convert keys on initialization
Merge pull request #197 from gregory/dont_convert_symbol_into_string_for_mash

dont convert keys on initialization
Work-around for rbx build failure, use rbx-2.2.10.
Allow #fetch access in Rash
Remove NO_DEFAULT, add test