Update to 0.7.2.

• Initialize libvlc with appropriate arguments on OS X
• Prevent libvlc 2.2 argument warnings by not using the deprecated --album-art argument when building against 2.2. This argument will be removed entirely in a future feature release as its presence only reflected the libvlc default behavior anyway.
• Ensure playback is terminated when encountering an invalid queued MediaSource [#330154].
• Prevent a crash when when GUIs call setCdTrack on a not-yet-ready MediaPlayer [#329121].