fix object de-authorize failed.

Gemfile

@@ -53,7 +53,7 @@ gem 'mongoid-encryptor', :require => 'mongoid/encryptor'
 gem 'rb-readline','~> 0.4.2' if RUBY_PLATFORM.downcase.include?("linux")
 
 
-gem "impressionist", :git => 'git://github.com/charlotte-ruby/impressionist.git'
+gem "impressionist",'1.2.0'
 #gem 'contacts'
 #gem 'event-calendar', :require => 'event_calendar'#, :git => 'git://github.com/elevation/event_calendar.git'