[2.0] DBAL cleanups (DDC-46). Proxy class improvements (DDC-19, DDC-39). Started new UPGRADE_TO document for upgrade instructions between advancing Doctrine 2 versions.

[2.0] Refactoring some common code in to the AnnotationDriver and creating PhpDriver for consistancy

[2.0] Refactored classloader architecture. Renamed ClassLoader => GlobalClassLoader. Introduced IsolatedClassLoader that is suitable for participating in autoload stacks. Added 2 example entity classes to the sandbox with 2 xml mappings and 2 yaml mappings. Simplified sandbox setup.

[2.0] Updating sandbox cli to use APC again but adding comment to use ArrayCache if APC is not available

[2.0] Changing sandbox to use ArrayCache by default so it doesn't require APC. Added comment with APC as the recommended for production

[2.0] Updated description for pear packages. Enhanced ClassLoader to support the old namespace separator (underscore) for Zend/PEAR/... compatibility until some day when they all use 5.3+.

[2.0] Work on CLI: Added SchemaToolTask with preliminary support for dropping/creating the database schema. Prepared the sandbox. Adjusted build to include the sandbox.

Refactorings for schema files and Doctrine_Record builder. More to come but got held up on some things that zYne- must fix first.

Ticket: 299

- Added a small cli script to run the compiler from the command line. The script requires the Doctrine base directory (the directory where Doctrine.php and the Doctrine folder is in) and the target file as its parameters.

Example: ./dev/Doctrine/ ./dev/myproject/BundledClasses.php