add compiler pass for bundles to register mappings
refactor instantiation to use factory methods
fix typo and cleanup docblock
fix issues on compiler pass
adjust to https://github.com/symfony/symfony/pull/7755
use drivers from common, not deprecated orm ones
improve doc on managerParameters
ws fixes
Merge pull request #177 from dbu/doctrine-register-mappings-pass

[WIP] add compiler pass for bundles to register mappings