[zen-60] Make doctrine/common an optional dependency
[zen-60] Make doctrine/common an optional dependency

- Marked doctrine/common via require-dev and suggests in composer.json
- Updated travis config to pass --dev flag to composer
- Added test constant flags to test configuration to skip annotation
  tests unless flag is true

samsonasik/zend-i18n-resources,Eye4web/zend-i18n-resources