Removed dependencies on slf4j-log4j and the mysql jdbc driver
Removed dependencies on slf4j-log4j and the mysql jdbc driver

Both dependencies should be provided by the user of metafacture because
the concret implementation depends on the environment.

dswarm/metafacture-core,zazi/metafacture-core,cboehme/metafacture-core,guenterh/mf3SourceCodeEnhancements,schaeferd/metafacture-core,metafacture/metafacture-core,dswarm/metafacture-core,knutwalker/metafacture-core,culturegraph/metafacture-core,philboeselager/metafacture-core,schaeferd/metafacture-core,cboehme/metafacture-core,culturegraph/metafacture-core,dswarm/metafacture-core,hbz/metafacture-core,metafacture/metafacture-core,guenterh/mf3SourceCodeEnhancements,cboehme/metafacture-core,hbz/metafacture-core,philboeselager/metafacture-core,schaeferd/metafacture-core,knutwalker/metafacture-core,hbz/metafacture-core,metafacture/metafacture-core,guenterh/mf3SourceCodeEnhancements,knutwalker/metafacture-core,zazi/metafacture-core,cboehme/metafacture-core,culturegraph/metafacture-core,philboeselager/metafacture-core,zazi/metafacture-core