添加ngStorage依赖.解决短期内不在重复播放的问题
将时间戳存储到history中.
naming things
Merge pull request #1 from seansay/dev_old_song_never_play

naming things.
Merge pull request #10 from wangxiaomo/dev_old_song_never_play

[issue#5]短期内不播放重复的歌