Module t.w.log

Logging tools. This is still in flux (even moreso than the rest of web2).

Class	_LogByteCounter	No class docstring; 2/4 methods documented
Interface	ILogInfo	Auxilliary information about the response useful for logging.
Class	LogInfo	Undocumented
Function	logFilter	Undocumented
Class	LogWrapperResource	No class docstring; 1/1 methods documented
Class	BaseCommonAccessLoggingObserver	An abstract Twisted-based logger for creating access logs.
Class	FileAccessLoggingObserver	I log requests to a single logfile
Class	DefaultCommonAccessLoggingObserver	Log requests to default twisted logfile.