First pass at logging adjustments: adding log_level to config and implementing against Mage::Log calls.

Conflicts:
	README.md
Escalating log level for session concurrency exceeding threshold.
Adding debug loggers.
Deprecating log_broken_locks and performing a minor version bump.
Adding debug instrumentation for lock timings, compression timing, and compression ratio.
Function hasConnection() does not have $host or $port available in its scope. Updating logger.
Adding $tries count to “waiting for lock” logger.
Updating logger for __construct()
Testing float typecasting.
Correcting timeStart, as logLevel is not yet defined :)
Merge branch 'feature/instrumentation' into feature/configurable-sleeps

Conflicts:
	code/Model/Session.php