[2.0] Refactoring code for reading multiple sources of mapping information from ClassMetadataExporter to a new ClassMetadataReader tool so it can be used to read mapping information easily from multiple different sources. This is used for generating repositories, converting mapping information, generating entity stubs, etc. Generally though, it is useful to be able to read the information for some mapping files into an array of ClassMetadataInfo instances without it being bound to the ORM and the metadata referenced by the EntityManager ClassMetadataFactory

[2.0] Renaming orm:generate-entity-stubs to orm:generate-entities to be consistent and fixed a few bugs

[2.0][DDC-359] Adding some tests for CliController and fixing bug with empty option value .i.e "--option="

[2.0] Refactoring AnnotationExporter code to a EntityGenerator tool which is used now in orm:convert-mapping to generate annotated entities and also used in orm:generate-entity-stubs for generating entity classes and properties/method stubs from mapping information

[2.0] Extracting Doctrine 1 schema conversion from orm:convert-mapping task to a orm:convert-d1-schema task

[2.0][DDC-426] Fixed issue with CliController that never notifies if run() executed successfully or not.

[2.0][DDC-364] Added Doctrine\Common\Version which provides the current version of Doctrine. Also added CLI tasks for Common and DBAL, since they may vary in the future.

[2.0] Incorporated CLI refactorings. Added support to namespaces and unlimited depth namespaces. Dropped globalArguments for now, since they interfer in DAG implementation.