#79 - Window transparency fix for Mac OS X for JDK 7 and 8
Minor WebProgressBarUI visual improvements for indeterminate state
WebPopupMenu XML skin fix
PopOverListener added to enable some of pop-over events listening
PluginManager feature added to support hot-loadable plugins within your application
Log feature added to simplify application logging scheme
Slf4j and its simple implementation added to dependencies and now used for WebLaF logging output
Language switch method added into LanguageManager to simplify switchin between supported languages
Major AsyncTreeTransferHandler fixes for some drop operations
XStream version updated to newest one
Code refactoring