#9 Need ability to setup logger for Connection and others

[Sozonnik Andrew]

All classes in project use standart logger based on its
class name i.e. loggers names looks like "ie.omk.smpp.
Connection" etc.
But if there are several connections to different
SMSCs, everything is writing to one file which is very
hard to analyze.
It will be nice if one can pass logger to Connection
and Connection itself pass this logger down to other
classes to make logger write each connection
information to separate files.