Make object factory configurable on class creation

[leakingtapan]

Description

There are several restrictions on how the rof could be used in various situations:

• It's impossible to configure the size of List being generated. Because the size supplier is hard coded here. Similar limitation applies to other collection types such as ArrayList, etc.
• It's impossible to configure how a specific filed within a class is generated. For example, class A has two fields String str1 and String str2, user might want str1 and str2 be generated in two different ways
• User might want different behavior when object creation failed. See Throw exception when ROF can't initialize class properly. #25 for an use case.