Symbolize inbound keys on Dash, update README, ignore .gemspec since …

…GitHub doesn't build gems anymore.

.gitignore

@@ -3,3 +3,4 @@
 coverage
 rdoc
 pkg
+/hashie.gemspec

README.rdoc

@@ -50,13 +50,14 @@ can set defaults for each property.
       property :email
       property :occupation, :default => 'Rubyist'
     end
-  
+
     p = Person.new
     p.name # => nil
-    p.occupation # => 'Rubyist'
     p.email = 'abc@def.com'
-    p.email # => 'abc@def.com'
-    p['awesome'] # => NoMethodError
+    p.occupation   # => 'Rubyist'
+    p.email        # => 'abc@def.com'
+    p[:awesome]    # => NoMethodError
+    p[:occupation] # => 'Rubyist'
 
 
 == Note on Patches/Pull Requests

lib/hashie/dash.rb

@@ -56,7 +56,7 @@ def self.defaults
     # Retrieve a value from the Dash (will return the
     # property's default value if it hasn't been set).
     def [](property_name)
-      super || self.class.defaults[property_name.to_sym]
+      super(property_name.to_sym) || self.class.defaults[property_name.to_sym]
     end
 
     # Set a value on the Dash in a Hash-like way. Only works