Add segmented control.
Navigate between pages.
Update backward and forward button states.

But it doesn't work now. :(

Netease uses history.pushState or something so page is not reloaded.

Will look into this later.
Update window title.
Support fullscreen mode.
Add marks.
Fetch the current playing song.
Show a notification when user switches the song.
Fetch the album image.
Use `stringByEvaluatingJavaScriptFromString` for less conditions.
Show an image with the notification.
Create the image in background.
Replace album images with high dimension ones.
Merge branch 'master' of github.com:luosheng/Netease-Music-Wrapper