Revert "Update POM version numbers to 5.0.0-rc2"

This reverts commit ceb3c487984ba48b210af85cfd97c65ed0f7a540.
Update last version number to 5.0.0-rc2
Fix logback.xml XML header

`mvn` without this commit complained about
the logback.xml file (loudly).
Merge pull request #912 from joshmoore/fix-logback

Fix logback.xml XML header
Merge pull request #905 from melissalinkert/rc2-revert

Revert "Update POM version numbers to 5.0.0-rc2"
Merge remote-tracking branch 'origin/dev_5_0' into deprecation

Conflicts:
	components/autogen/pom.xml
	components/bio-formats-tools/pom.xml
	components/bundles/bioformats_package/pom.xml
	components/bundles/loci-tools/pom.xml
	components/bundles/ome-tools/pom.xml
	components/common/pom.xml
	components/forks/jai/pom.xml
	components/forks/mdbtools/pom.xml
	components/forks/poi/pom.xml
	components/forks/turbojpeg/pom.xml
	components/formats-api/pom.xml
	components/formats-bsd/pom.xml
	components/formats-gpl/pom.xml
	components/loci-common/pom.xml
	components/loci-plugins/pom.xml
	components/metakit/pom.xml
	components/native/bf-itk/pom.xml
	components/native/pom.xml
	components/ome-io/pom.xml
	components/ome-plugins/pom.xml
	components/ome-xml/pom.xml
	components/specification/pom.xml
	components/stubs/lwf-stubs/pom.xml
	components/test-suite/pom.xml
	components/xsd-fu/pom.xml
	pom.xml