Add the parameter for enable or disable listen of exception.

[ZhukV]

In many cases, we should not send the error on development node.

Maybe add the parameter for control enable or disable listen to the exception?

sentry:
    enable: "!%kernel.debug%"

[Jean85]

That's not always true. Sentry has the possibility to store the environment of the errors, so it can be used in development (or staging or whatever) too.

To disable error reporting, you can either include the bundle only in the prod environment, or set the DSN in the config as null.

(this is a duplicate of #76 #46 #38, closing for this reason)

[aonamrata]

This should have been added to sentry docs. I was looking to do this in raven for node js. setting the DNS to null works.

[Jean85]

That is already stated in the readme: https://github.com/getsentry/sentry-symfony#step-3-configure-the-sdk