Merge pull request #182 from janih/master

Fix NPE in SyModuleImpl
Preparing release 1.5.0
Updated build plugins
Migration to rome-parent
Removed type parameter from CopyFrom interface
Refactored some code
Replaced Collection.size() > 0 through !Collection.isEmpty()
Migrated logging to SLF4J
Refactored code
Added build status for all ROME projects
Fixed header
updated build information (fixes #179)
developer informations added
enhancement for #181 - sets user-agent header on UrlConnection
Added snapshot repository
Harmonized serialVersionIds
Formatted and cleaned up sources
Renamed and harmonized packages
Removed "cyclic dependency" to parent POM
Fixed connection urls
Prepared release