Swap '[', ']', '{', '}' keys for kana input

When inputting with Kana input mode, '[', ']' keys were not converted to
Japanese character.  Instead  '「', '」' were shown.

Renamed:
- [] bracket
- {} brace
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