[logback-dev] Reverted logback license back to LGPL

[Ceki Gulcu]

Hello all,

I have reverted the logback license from GPL+classpath exception to
the original LGPL. Given that GPL+classpath exception proved as
controversial as the original LGPL, there is no point in changing for
more of the same.

Note that the previous license (GPL+classpath) was introduced in SVN on April 
the 8th, 2008 and was marked as tentative. Moreover, GPL+classpath was never 
used in a logback distribution.

Just cleaning up...

-- 
Ceki Gülcü