0.9.0

This version mainly improves upon existing features, and includes a handful of new additions and bug fixes.

Updates:

• Implemented hit object stacking algorithm. (#61)
• Implemented "Half Time" and "Double Time" mods. Note that pitch is shifted, though. (#68)
• Added playback speed selection during replays. (#68)
• Improved hit animations during gameplay. (#71)
• Implemented Catmull curves. (#76)
• Added additional download servers: osu!Mirror and Hexide.
• Changed font to Droid Sans Fallback.
• Bug fixes for clip loading (#59, #60, #84), fade-in issues (#63), and XDG problems (#58).
• A lot of code refactoring/renaming.