translation done almost 25%
done before ACTIONS
Change feedkey to avoid error bells

In MacVim, <C-R><ESC> causes error bells.
Merge pull request #100 from todesking/avoid-error-bells

Change feedkey to avoid error bells
- Fixed indentation.
modified
deleted *.swp
- Refactored is_windows.
modified
modified
modified
- Improved load_default_scripts().
- Fixed initialize context.
- Refactored.
modified
- Fixed is_win error.
- Improved split patterns.
- Added util function.
- Used helper functions.
- Fixed find source input bug.