Documentation fixes

Documentation fixes, continuing the work done on [ORM](https://github.com/doctrine/doctrine2/pull/528) and [DBAL](https://github.com/doctrine/dbal/pull/243).

- Missing docblocks
- Missing / incorrect `@param` / `@return` / `@throws` annotations
- Missing newlines between annotations
- Incorrect vertical alignment of `@param` annotations
- Incorrect doctrine-project.org links
- SVN leftovers cleanup
- Licensing (LGPL => MIT)