Merge pull request #214 from collapso/master

Update default template referencing to use the default since Symfony 3.4

Merge pull request #213 from shouze/perf-retrieve-component-with-index

perf: retrieve component by using indexed column

Merge pull request #211 from kesslerdev/patch-1

remove deprecated usage of getExtension

Merge pull request #210 from core23/patch/doctrine

Added doctrine <2.6 to conflicts

Merge pull request #209 from tibineogen/symfony-4-support

update to support symfony 4

Remove php 5.3 tests on travis-ci.

Merge pull request #204 from 7thcubic/7thcubic-patch-2

Multiple spread classes failure to load

Merge pull request #202 from pppdns/patch-1

Fixed fatal error in dependency injection config

Spread priorization.

Must get reference, not definition directly.