Merge pull request #7770 from Dhilan007/v3-label-issue

close issue#5734:Label:The letters sometimes slightly cut.
[ci skip]
[AUTO]: updating luabinding automatically
[AUTO]: updating luabinding automatically
Merge pull request #7776 from CocosRobot/update_lua_bindings_1407982527

[AUTO]: updating luabinding automatically
Merge pull request #7778 from CocosRobot/update_lua_bindings_1407983300

[AUTO]: updating luabinding automatically