Updates to make ready for 2.0 release

- 99% code coverage <del>Almost 100% test coverage, see my RFC below for what remains</del>
- Made Symfony 2.3 the minimum requirement

### TODO

- <del>update readme</del>
- <del>add to scrutinizr (can you give me admin access to this repo so I can add?)<del>

### <del>RFC</del>

<del>I'd like some feedback on the following issue:</del>

<del>The command is currently `ContainerAware`.  This makes it a pain to test... I would like to make it a service and tag it with `console.command`.  This requires symfony 2.4... We wouldn't need to bump the entire bundle's requirement to 2.4 - you just can't use the command in 2.3.  What do you think?</del>

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Any other feedback would be appreciated.