Fix versions for maven quickstart

Conflicts:
	docs/user/tutorial/quickstart/artifacts/pom.xml
Update maven quickstart
Fixing NE download and note that CachingFeatureSource is deprecated (#542)

This resolves pull request https://github.com/geotools/geotools/pull/542
ContentFeatureCollection NPE with DataUtilities.collection (GEOT-4893)

See https://jira.codehaus.org/browse/GEOT-4893