Mu 0.4 release

Mu 0.4 release plan

Phase              Original plan  Updated plan   Realized
Feature Freeze     ---            ---            ---     
Alpha Release      ---            ---            ---
Beta Release       ---            ---            ---
Stable Release     ---            ---            ---
Release Candidate  ---            ---            ---
Final Release      ---            ---            14th Dec 2014

New Features:

Core:

• Add integer preference item.

Music Module:

• Support tweak lyrics line spacing.
• Loading lyrics according to the detail info of the current file.
• Lyrics download from XiaMi.
• Lyrics download from QQMusic.
• Lyrics download from Baidu.
• Enable FFMpeg on Mac OS X.
• Support output VOX playlist.
• Support output m3u playlist.
• Support output ttpl playlist.
• Support output wpl playlist.
• Support output iTunes playlist.