This extracts logic for running factories based on name and either strategy class, symbol representing a strategy, or nil (defaulting to the create strategy)
evaluator_class contains the fully-inherited list of attributes; this includes parent classes, traits, etc. When calculating associations for an individual factory, the factory should use inheritance to build the list instead of merely accessing association attributes on itself. Closes #293
There were some big issues with trying to undefine specific methods on the Evaluator. After investigating maybe inheriting from BasicObject (or ActiveSupport::BasicObject since BasicObject is 1.9+), that turned out to be too much of a pain because it undefines almost everything, including class and a handful of other methods necessary for Evaluator to work properly. The second solution was to undefine all private methods. The problem is, when other libraries defining methods (private or otherwise) on Object are loaded *after* factory girl, those methods get added and Evaluator sees those methods on Object. So, that solution didn't directly work either. This commit removes undefining methods (the sole reason of which was to capture with method_missing and process ourselves, returning the override or cached value) and instead introduces a new concept - iterating over each override and defining it as a method on the evaluator INSTANCE. This means that overrides don't collide because they're on the instance and we don't have to worry about undefining methods so that method_missing kicks in. This is the most stable and guaranteed way to get this to work because the overrides are applied to each instance at runtime. Closes #279, #285
REE will fail to install Rails 3.2 gems w/o rubygems update.