Log Message:
Update ibus-qt to 1.3.1.

* Fix build error with binutils-gold
* Add debian package support from Li Daoing's repository
* Fix build error with cmake-2.6
* Use if(NOT ..) to replace if(NOT DEFINED ..) in CMakeLists.txt
* Use memset to init memory block.
* Merge remote branch 'origin/debian'
* Fix background and foreground in preedit QTextCharFormat.
* Added hotkeys in IBus::EngineDesc .