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The unset functionality is not working for foreignKey relations

Small documentation issues, insert query which hadn't had a value, reference to an example above should be below
Ticket: 656

Changed loadModels() once again. Removed loading of models based solely on model filename. Added support for different models with the same file names. All models files are required, in order to determine class names. The changes result in an overall increase in flexibility with respect to model file names.

Doctrine_Query_Tokenizer::bracketExplode() were case sensitive, and 
changed tokenizer to make them case insensitive.

Introduced a new attribute ATTR_AUTOLOAD_TABLE_CLASSES that can be used to control whether Doctrine should try to autoload custom table class files when looking for them.

Ticket: 650