[WIP] Refactoring to use container

[dantleech]

This PR introduces dependency injection, fixing #35.and tidying up the mess of helpers.

Todo:

• Behat tests should pass
• PHPUnit tests should pass
• PHPSpec tests should pass
• Test embedded application -- write tests for it
• QusetionHelper is not a drop-in-replacement for DialogHelper. Either force minimum Symfony version to be 2.6 or add a fallback.
• Run code fixer

[dantleech]

Decided to use the Symfony DI Container instead of Pimple/whatever as I guess its more likely to be already available when run in embedded mode.

[dbu]

looks good!
regarding requiring symfony 2.6: we could then no longer require this in the doctrine bundle i think. rather have graceful degradation, like less helpful interaction or something. doing the whole work double seems wrong too, however.

[dantleech]

Well it should be possible and not too hard to add a fallback -- but saying that this isn't required by the bundle, its a suggests.. but as long as its not too hard it should be fine.

[dantleech]

Have removed the EmbeddedApplication, instead the MODE should be passed to the Container, and the container passed to the ShellApplication.. hmm. maybe that doesn't work as the EmbeddedApplication does need to auto-exit in command mode.

Maybe EmbeddedApplication should instantiate its own Container after all.

[dantleech]

• ->askConfigmration on QuestionHelper does not exist
• Make BC with 2.5 including adding dummy phpcr helper for existing DoctrinePHPCRBundle integration.

[dantleech]

Now testing with both modes of operation