v2.1.1

(changes from 2.0 and up)

• Fix issue where to_h was incorrectly mutating arrays containing hashes
• Adds conversion back to a hash with to_h and to_dot_h for enumeration.
• Completely rewrite internals and remove Active Support as a dependency (this means HashWithDotAccess::Hash supports string, symbol, and dot access with zero dependencies)
• Dot access now writes accessors to the class, improving performance (method_missing only runs once per key/accessor, essentially)