twitter: accept @ in front of screen name
twitter: accept @ in front of screen name

Former-commit-id: 590560c07dbc84dfd8ff37c5756b7c2affe91d4d
Former-commit-id: 0521d6bc721487d4f221d6b92f68e722640101e5
torhve/ivar2,torhve/ivar2,haste/ivar2,torhve/ivar2