Revert "learnProject"

This reverts commit f5328a2c8e61a4a8007600871b965bfd2200f992.

Conflicts:
	cgss/src/cg/center.go
	cgss/src/cg/centerclient.go
	cgss/src/cg/player.go
	cgss/src/cgss.go
	cgss/src/ipc/client.go
	cgss/src/ipc/ipc_test.go
	cgss/src/ipc/server.go
	musicManager/src/entry/musicEntry.go
	musicManager/src/manager/manager.go
	musicManager/src/manager/manager_test.go
	musicManager/src/mplayer.go
	musicManager/src/player/MP3Player.go
	musicManager/src/player/play.go