Merge pull request #799 from TsudaKageyu/filetype-detection

Enable FileRef to detect file types by the actual content of a stream.

diff --cc NEWS
index 679082640cc81579d7e439c2960b69513735fd33,f8136f9a287b29f12131f0d9e166471547157de6..4a7abb56d90a05b1b0f7f7708ed3738de1a258ab
--- 1/NEWS
--- 2/NEWS
+++ b/NEWS
@@@ -4,11 -4,11 +4,12 @@@
   * Added support for classical music tags of iTunes 12.5.
   * Dropped support for Windows 9x and NT 4.0 or older.
   * Fixed reading MP4 atoms with zero length.
 + * Fixed reading FLAC files with zero-sized seektables.
   * Fixed handling of lowercase field names in Vorbis Comments.
 + * Fixed handling of 'rate' atoms in MP4 files.
   * Fixed possible file corruptions when saving Ogg files.
 - * Fixed reading FLAC files with zero-sized seektables.
   * Better handling of invalid UTF-8 sequences.
+  * Marked FileRef::create() deprecated. It returns null.
   * Several smaller bug fixes and performance improvements.
  
  TagLib 1.11.1 (Oct 24, 2016)