Do not install brew
Fixed vim alias.

- Only set vim alias if MacVim is installed (using homebrew or not)
Updated vim-slim submodule.
Color improvement
Added ,gt html tidy command
Sprintly alias
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