Merge pull request #9 from alja/master

Fix open issues #4 #5.
Merge pull request #10 from alja/master

Enable ReadV for the caching proxy.  Replace the fork/exec of "find" with a separate thread which uses the XrdOss interface.
Log removed files. Check cached files to purge in max. 2h period interval.
Allow cache expiration time as configurable parameter.
Set Factory::GetUserName() and Factory::GetTempDirectory() private.
Return reference to XrdOss in Factory::GetOss().
Check return value of XrdOssDF::Open() and XrdOssDF::Close(). Change file cache temp directory from /tmp/xrootd-file-cache to /var/tmp/xrootd-file-cache.
Add spec file for RPM packaging.
Switch to 3.3.0 headers.
Add file-path in log prefix.
Fix compilation warning (sign compare stuff).
Add more log messages.
Merge pull request #12 from alja/master

Minor fixes and additional log messages.
Merge https://github.com/bbockelm/xrootd-file-cache
Fetch changes from Brian's repo.
Move to xrootd trunk.