Fixes bug where documents recreated from the database were
being stripped of their protected attributes when instantiated
Signed-off-by: Marcos Tapajos <tapajos@Tapajos-MacBook.local>
Public Facing
* through either :protected or :accessible8 flags
* prevents protected attributes from being set in mass assignment
Developer Facing
* refactors #initialize and #update_attribute_without_saving
to use same private methods to set attributes on ExtendedDocument
* adds new mixin to do protection
Signed-off-by: Tapajós <tapajos@gmail.com>