Change slf4j license from MIT to ASL 2.0 and MIT

[Stanislav Ochotnicky]

Two jars are implementing apache-commons-logging and log4j APIs and upstream
decided to license them the same way to avoid any possible problems (I assume). 

In any case this shouldn't be a problem for projects using these since both
licenses are liberal enough


-- 
Stanislav Ochotnicky <sochotnicky at redhat.com>
Software Engineer - Base Operating Systems Brno

PGP: 7B087241
Red Hat Inc.                               http://cz.redhat.com
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