client: Added first version of Windows client.

This new Windows client is based on the commercial Dokan alternative CBFS (Eldos Callback File System). As open source project, XtreemFS was granted a non-commercial license to use CBFS.

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@3633 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534