Merge pull request #243 from gonzedge/submodules-init

Remove unused submodules directories.
Vim plugins and prezto updated
Improved sass colors
Remove arpeggio; unused
Added vim-gitgutter, which shows git diff in the gutter
Upgrade plugins
Merge pull request #246 from irrationalfab/vim-gitgutter

Added vim-gitgutter, which shows git diff in the gutter
Upgrade plugins
Remove gitgutter; causes errors
Add gitgutter
Merge pull request #247 from irrationalfab/vim-gitgutter

Add gitgutter
Removed unused / not working ,,f ,,F aliases
Readme cleanup
Renamed vim/plugion/settings/fugitive.git to vim/plugin/settings/fugitive.vim. Fixes issue #249
Removed unused plugin ruby_focused_unit_test
Merge pull request #250 from kmees/issue_249

Renamed vim/plugion/settings/fugitive.git to vim/plugin/settings/fugitiv...
Updated subprojects
Added ,mm to switch to mailer while in view
Revert "Added ,mm to switch to mailer while in view"

Conflicted with showmarks in an ugly way
This reverts commit 44a2cd79d09aea86c464d4880d5fdfe8b378d7ce.
Add solarized themes for iTerm2

Both solarized dark and light are now included in the subdir
iTerm2. They are copies from the original repo because it doesn't
seem worth to clone a ~10Mb repo just to keep in sync 2 files,
considering that solarized hasn't changed much in the past years.

The rakefile has been updated to trigger the automatic installation
of these two themes only if OS == OSX. The user will still have
to set the themes for his/her current profile manually (but that's
explained at the end of the installation process).