Adds timestamping functionality.

Methods
Attributes
[RW] access_time
[RW] control
[RW] control
[RW] control
[RW] create_time
[RW] update_time
Public Instance methods
touch!()
    # File lib/og/model/timestamped.rb, line 28
28:   def touch!
29:     self.instance_attribute_set(:access_time, Time.now)
30:   end
updated!()
    # File lib/og/model/timestamped.rb, line 24
24:   def updated!
25:     self.instance_attribute_set(:update_time, Time.now)
26:   end