* Use lang/ruby/gem.mk instead of misc/rubygems/rubygem.mk.
* Add LICENSE.
* Ajust new ruby package's framework.
* Update dependency according to gemspec.
Changes are too many to write here, please refer History.txt.
Logging is a flexible logging library for use in Ruby programs based
on the design of Java's log4j library. It features a hierarchical
logging system, custom level names, multiple output destinations per
log event, custom formatting, and more.