[MaNGOS/WotLK] Fix LuaUnit::SetBindPoint

Signed-off-by: Salja <salja8840@gmail.com>
[MaNGOS/WotLK] Fix LuaUnit::HasUnitState

Signed-off-by: Salja <salja8840@gmail.com>
[MaNGOS/WotLK] Fix LuaUnit::ClearUnitState

Signed-off-by: Salja <salja8840@gmail.com>
[MaNGOS/WotLK] Fix LuaUnit::AddUnitState

Signed-off-by: Salja <salja8840@gmail.com>
[MaNGOS/WotLK] Fix IsQuestGiver

Signed-off-by: Salja <salja8840@gmail.com>
[MaNGOS/WotLK] Fix LuaUnit::AddItem

Signed-off-by: Salja <salja8840@gmail.com>
Merge pull request #38 from Salja2012/master

[MaNGOS/WotLK] Fix some UnitMethods