Add dependency metadata/API to xPDOTransport

Merge remote-tracking branch 'origin/pr/16' into develop

* origin/pr/16:
  Add changelog entry
  Add dependency metadata/methods to xPDOTransport
Moving before renaming for case-insensitive systems
Class renaming
Namespaces ya'll!
Fix xPDO::newQuery() class loading
Refactor tests
Rename test classes with _ in name
Rename test classes
Update sample model and unit tests
Fix tests, sample schema, and add xPDOMap
More refactoring goodness; thank you unit tests!
Fix remaining broken unit tests
Refactoring xPDOGenerator, adding xPDOReflectionClass, etc.
Refactor for new model support

Moves existing tests for models built with schema_version < 3.0 to xPDO\Legacy
Adds new tests for namespaced models built with schema_version >= 3.0
All new and legacy tests passing!
Cleanup, renaming generator to xpdo, etc