Change the ControllerResolver type hint to Psr\Log\LoggerInterface
merged branch igorw/psr-log-typehint (PR #741)

This PR was squashed before being merged into the master branch (closes #741).

Discussion
----------

Change the ControllerResolver type hint to Psr\\Log\\LoggerInterface

This allows it to work with any logger, in particular, it un-breaks the case where the monolog bridge is not installed.

See also 817240e40335092852186409dac64c13a494ec52. This should resolve #740.

Commits
-------

b85d610 Change the ControllerResolver type hint to Psr\Log\LoggerInterface