Update vimfiler.txt

udpate QA
Merge pull request #95 from tkhr/patch-1

Update vimfiler.txt
- Improved find behavior.
- Fixed vimfiler syntax.
- Fixed for UNC path.
- Added <Plug>(vimfiler_jump_first_child) and <Plug>(vimfiler_jump_last_child) mappings.
- Added g:vimfiler_tree_indentation.
- Added example.
- Changed g:vimfiler_tree_indentation behavior.
- Fixed nest view.
- Fixed vital initialization.
- Added -tab option.
Docfix: the default g:vimfiler_tree_indentation isn't ' ' but 1
Merge pull request #106 from ujihisa/master

Docfix: the default g:vimfiler_tree_indentation isn't ' ' but 1
- Fixed split behaivor.