Updated the remaining submodules.

 7491f1c89331d0a5b1b7458e14ff3abc75b814e4 bundle/csv.vim (heads/master)
 72a09b659c2b822eca329e722a6dda7e99267b6e bundle/vim-markdown-extra-preview (heads/master)
Vimrc: git commands, rooter patterns, SmartResizeWindow()

Git commands:
    - made most commands use Shell
    - added git rebase section
    - changed git stash keybind conflict
    - added git show for word under cursor

Rooter patterns:
- updated rooter patterns so that it works properly with git submodules

SmartResizeWindow()
- Reengineered MakeSmallWindow into SmartResizeWindow