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

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- Fixed problem with Nested Set table definition not happening in time for exporting when NestedSet behavior is added through Doctrine_Template_NestedSet.

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The default is set to false because fetching the relations deletes
previously fetched relations =P. This is, if you fetched an aggregated
value (SUM, COUNT), it wont be refreshed, it will be overwritten by the
actual related values.

Consolidated a few things. Initial entry of Inflector class. Moved some methods from Doctrine base class to Doctrine_Lib and Doctrine_Inflector.

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