Use dropAndCreateDatabase schema manager function in test initialization instead of individual versions of each.

[2.0] DDC-294 - Added "postConnect" event in Doctrine\DBAL\Connection and refactored TestUtil to allow configuration of DBAL EventManager Subscribers by the use of PHPunit Xml configuration.

[2.0][DDC-164][DDC-165] Fixed. Cleaned up ManyToManyMapping. Cleaned up identifier handling and handling of composite identifiers in some places.

[2.0] Fixed DDC-63 and DDC-106. Oracle tests for SchemaManager need further tweeking, marked as skipped for now.

[2.0] Solved the hassle with dropping/creating the test database through introducing a second test database for temporary connections. Please check the dbproperties.xml.dev file for reference. The 2 test databases need to be created *once* before the very first time of running the tests. New procedure successfully tested against mysql, postgresql, oracle.

[2.0] Adjusted getConnection since there is no need to create/drop the database for sqlite in-memory.

First tests for basic collection implementation. First experimental use of closures (Currently commented out, because the svn server makes a syntax check against 5.2.x).

Added getters to AST. Removed Production::__call. Added visitor support to AST. (guilherme: dont shoot me yet :-). visitor support doesnt hurt even if we do not use it for SQL generation). Lots of other things.

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