add status bar
Merge pull request #123 from igemsoftware/LC

add status bar
OK
Merge pull request #124 from igemsoftware/LC

OK
Merge remote-tracking branch 'origin/master' into LC
Merge pull request #125 from igemsoftware/master

Update
Merge branch 'LC' of https://github.com/igemsoftware/SJTU-Software_2014 into LC
modify bar
Merge pull request #126 from igemsoftware/LC

bar modification
Merge pull request #127 from igemsoftware/Cao

Cao
Merge pull request #128 from igemsoftware/master

master into Cao