Removed Mash#id and Mash#type.

Ruby 1.8.7 had Object#id and #type, both of which were deprecated,
which Hashie::Mash wanted to cover with more reasonable methods.
These methods in Object were removed in ruby 1.9.  The cover methods
are unneeded, and can cause problems with Mash::SafeAssignment
preventing you from using these as keys.

Fixes #290

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## Next Release
 
-* Your contribution here
+* [#292](https://github.com/intridea/hashie/pull/292): Removed `Mash#id` and `Mash#type` - [@jrochkind](https://github.com/jrochkind).
+* Your contribution here.
 
 ## 3.4.1 (3/31/2015)
 

lib/hashie/mash.rb

@@ -92,14 +92,6 @@ def initialize(source_hash = nil, default = nil, &blk)
 
     class << self; alias_method :[], :new; end
 
-    def id #:nodoc:
-      self['id']
-    end
-
-    def type #:nodoc:
-      self['type']
-    end
-
     alias_method :regular_reader, :[]
     alias_method :regular_writer, :[]=