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 :)
Adding additional verbose logging for debug mode.
Logging bot detection, zombie checks, and prepending log statements with PID
Prepending all logger statements with the current PID.
Including additional timing data in log messages.
Syntax correction.
Correcting sprintf formatting for float value.
Merge branch 'master' into feature/instrumentation

Conflicts:
	README.md
Removing unnecessary class_exists checks.
Fix PHP Fatal error. Refs #19