Allowed for the configuration to be set via the MockitoAnnotations and Mockito classes

Allowed for the configuration to be specified through a new `MockitoAnnotations.initMocks(IMockitoConfiguration, Object)` method and also through `Mockito.setConfiguration(IMockitoConfiguration)`.

This allows the specification of a default answer programmatically rather than through a class on the classpath.  This is useful for not needing to remember to set the classpath in Eclipse, especially when there are many team members working on a project.