client: libxtreemfs and example_libxtreemfs compile on Windows. In particular,...

client: libxtreemfs and example_libxtreemfs compile on Windows. In particular, the following changes were needed:
- libxtreemfs interface functions CreateDirectory and RemoveDirectory had to be renamed to MakeDirectory and DeleteDirectory due to name clashes with Microsoft's ANSI/UNICODE #defines
- boost::bind had to be used everywhere to avoid confusions with TR1's bind.
- time functions required Windows specific code (no gettimeofday).
- ifdef'd out all UserMapping stuff

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@2648 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534