Fixed phpdoc
Private Tag in Torrent

Returns if the torrent is private or not
Merge branch 'develop' of https://github.com/stormwalkerec/php-bittorrent into stormwalkerec-develop
Updated PHPUnit version dependency
Renamed the name of the method fetching the optional private flag
Added two more test files
Updated values for some tests that was outdated when new test files were added
Added test cases for the isPrivate method
Updated ChangeLog