Started refactoring in DQL parser to separate Production into Parser and AST classes.
Finished first tests. Currently only 4 are active in IdentifierRecognitionTest, and only 2 are passing.

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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.

Cosmetics changes in EventManager, renamed the registerEventListener to addEventListener, optimized the source and changed the arguments order. Commented an echo line in RangeVariableDeclaration

Refactorings and initial commit/draft of new event handling / configuration / bootstrapping. Still need to remove all the static EntityManagerFactory::getManager lookup calls from the Production classes. The production classes need to have access to the EntityManager of the Query that constructed the Parser. It should be injected into the Parser during construction.

Fixes in ParserResult, which was generating a bad table alias. Added more test cases. Commented new Event system call in EntityManager. Fixes in RangeVariableDeclaration.

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