Harmonized panel structure, added GoogleDriveClient for simplified
access to the GoogleDrive API
Merge branch 'master' of
https://github.com/perdian/googledrive-uploader.git

Conflicts:
	src/main/java/de/perdian/google/api/apps/drive/uploader/gui/panels/filesystems/LocalFileSystemPanel.java
	src/main/java/de/perdian/util/swing/components/filesystem/FileDirectoryTreeNode.java
	src/main/java/de/perdian/util/swing/components/filesystem/FileSystemPanel.java