Installing the vim plugins: tagbar and textobj-entire
Modify the markdown snippet

I often use in markdown files utf-8 arrows. Now I can expand -> to UTF-8
arrows.
Dwb udates it's configuration
Ignoring another dirty submodule
Renaming keymappings.vim to extend.vim because it not only contains keymappings
Changing some things in the vimrc file

- Sourcing now extend.vim because I renamed it to extend.vim
- Changing the wildmode to full because it's more practically to see
  only the completing then a list of all possible completions.