Make explicit the reference to standard Hash
Fix assertions on a Dash's string representation
Add aliases for Mash#key? to conform with standard Ruby Hash aliases.
#inspect should start with #<
Hashes have a number of alternates to .has_key? which are shown at http://www.ruby-doc.org/core/classes/Hash.html#M000767 This commit adds those aliases for Hashie::Mash#key?
New Dash property option :required
Modify Hashie::Mash#respond_to? to work properly with delegation library
…lude_private argument - needed to work properly with Ruby's DelegateClass and friends