Merge pull request #1 from bessl/master

Added german i18n file.
AUTHORS.txt added
German added to list of supported languages
Taskbar: fix bug with taskbar overlaping opened elements of other taskbars

_openedElements( false ) had to be propagated to other taskbar instances
Update changelog and jQuery Plugin Package Manifest for v0.1.2
Dutch translation added (received by e-mail)
Taskbar: fixed text-align on vertical taskbar menu items
Variable name cleanup
Update changelog and jQuery Plugin Package Manifest for v0.1.3
Fixed some typos