Ticket: 156

- validators codes are now string instead of integers (constants)
- validating is now handled in record level
- added new component Doctrine_Validator_ErrorStack
- new methods Doctrine_Record::isValid() and Doctrine_Record::getErrorStack()
- errorStack now as a record instance variable

Ticket: 142

Fixed fatal bug in Doctrine_Hydrate resulting in wrong mappings when result set contains rows in 'wrong' order. 

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Fixed many-to-many handling when join table component is accessed before the associated component, fixes #136, #84

Major change on how transactions are being handled: insert / update queries are now executed immediately and only deletes are being gathered (due to delete optimization strategies). Fixes #138, #135

Ticket: 139

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Added new exception classes, renamed Doctrine_Repository to Doctrine_Table_Repository, refactored many classes

Ticket: 132

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Ticket: 134

Ticket: 133