Set ibus window position just below the cursor

These code is based on IMESupport.
git://github.com/chikatoike/IMESupport.git

Add SublimeIBus.sublime-settings for window layout

Required commands to get X window information:
- xwininfo
- xprop
x11-utils has above commands

Not support distraction free mode.
Disable surrounding text by default

If surrounding text is enabled, ibus_query_surrounding_text_cb will be
called and input keys won't be processed.
Use status.id_no instead of hard coded 0