Merge pull request #77 from ujihisa/master

better english
- Added g:vimfiler_ignore_pattern variable.
- Improved documentation.
- Fixed prompts in file operations.
- Improved documentation.
- Added screenshot.
- Fixed view
- Updated screenshot.
- Added FAQ.
- Added -find option.
- Fixed for error.
- Fixed vimfiler#get_filename().
- Redraw syntax in syntax enable.
- Fixed auto_cd behavior.
- Fixed switch behavior.
- Fixed switch behavior.
- Fixed error.
- Fixed switch behavior.
- Improved documentation.
- Fixed readonly.