Do not install brew
Fixed vim alias.

- Only set vim alias if MacVim is installed (using homebrew or not)
Updated vim-slim submodule.
Merge pull request #236 from giorni/slim-update

Updated vim-slim submodule.
Merge pull request #235 from rafaelregis/fix_vim_alias

Fixed vim alias.
Remove '..' alias.

- cd ..; cd ../..; cd ../../..; cd ../../../.. are aliased by
  default on zsh to ..; ...; ....; ..... respectively.
Use vim instead of vi.

- vi command uses vim that comes with the system instead of the one of MacVim.
Delete yuv alias, as asked by the comment.
Add quickfixsigns module - shows which lines changed
Removing duplicated vim plugins
Install homebrew only if it's not in the path already.
Follow code style.
updated vim nerdtree tabs plugin
Merge pull request #242 from szajbus/skwp

updated vim nerdtree tabs plugin
Merge pull request #239 from lfilho/master

Removing duplicated vim plugins
Merge pull request #237 from rafaelregis/aliases_cleanup

Aliases cleanup
Merge pull request #241 from calavera/skip-homebrew-install

Skip homebrew install if it's already in the path
Revert "Add quickfixsigns module - shows which lines changed"

This reverts commit ae8946dbb2b45c6086b0d7615e10fd8656a7d4d6.
Remove unused submodules directories.

Running `rake install`, runs the `:submodule_init` task,
which in turn runs the following command:

    git submodule update --init --recursive

This fails with the following couple of errors (separately):

    No submodule mapping found in .gitmodules for path 'vim/bundle/mattn-zencoding-vim'
    No submodule mapping found in .gitmodules for path 'vim/bundle/skwp-vim-indexed-search'

This was introduced by 3d60f721dd53e7f5414d11004c749784efc74f64
which removed the 'mattn/zencoding-vim' and 'skwp/vim-indexed-search'
submodules from the `.gitmodules`.
Merge pull request #243 from gonzedge/submodules-init

Remove unused submodules directories.