Moved Doctrine_Migration_Builder and Doctrine_Import_Builder to Doctrine_Builder_Migration and Doctrine_Builder_Record. Updated code to work with new class names.

fixes #689, which details problems with the handling of MySQL native enum columns and model class generation.

fixes #696 function was named synchronizeWithArray but i renamed it to synchronizeFromArray because it makes more sense because all the other mades user the term "from"

- LIMIT and OFFSET clauses allow only integers now
- Added support for INDEX BY
- Added more tests, fixed failing tests, etc.

Added Doctrine::HYDRATE_NONE example to "Fetch Only What You Need" subchapter of the "Improving performanc" chapter.