Restrict Monolog version to be in version <1.3

Because of conflict between `HttpKernel\Log\LoggerInterface` and `Psr\Log\LoggerInterface` (PSR-3)
merged branch stloyd/patch-1 (PR #6572)

This PR was merged into the 2.0 branch.

Commits
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ba2d035 Restrict Monolog version to be in version <1.3

Discussion
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[2.0] Restrict Monolog version to be in version <1.3

Because of conflict between `HttpKernel\Log\LoggerInterface` and `Psr\Log\LoggerInterface` (PSR-3).

Main `composer.json` already restricts to proper version, but bridge allows also conflicting version.

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by Seldaek at 2013-01-05T14:58:18Z

Looks fine, I will try to wrap up the 1.3.0 soon so you can migrate the code to use it (well it can already be done I guess in the master branch).