Add enable_amqp parameter. Resolves #57

[kix]

It appears to me that it's not the unavailability that we want to catch. I think the smarter way is to allow the app to be configured for ignoring the AMQP layer at all, this way I can extract the enable_amqp parameter into an environment specific config file depending on whether I need the queue:

In config.yml:

old_sound_rabbit_mq:
    enable_amqp:       %enable_amqp%

In parameters.yml (this file is in .gitignore usually):

parameters:
    enable_amqp: false

Parameter name can surely be changed to your liking. This affects the env-specific config file as well as the DI extension.

[blaugueux]

I don't understand the purpose of this PR. It has the same effect that the sandbox mode ?

[kix]

Whoops, it is really redundant. Closing.
However, sandbox mode is not documented in any way, and that seems like an issue.