TODO:
=====

* Add formatters functions that can be added to appenders to change
default formatting patters
* Add support for pattern appender
* Add support for file-based configuration to log4erl instead of only
programmable-only configuration that is working now
* Add support for SNMP appender
* Add support for DB appender (MySQL, Postgres, Mnesia,...etc)
* Add support for SMTP appender
* Add support for NT event appender
* Add support for syslog appender
* Add support for NDC-like logs
