<leader>-x runs execute-extended-command

I need a better overall keybinding for it, too.
Install scss-mode package from MELPA
Activate scss-mode for *.scss files
Call my-prog-mode-init from css-mode-init
Update package flycheck-20140821.801
Update package epl-20140822.136
Update package web-mode-20140819.938
Update package helm-20140822.129
Update package auto-complete-20140803.2118
Update package emmet-mode-20140821.1806
Update package php-mode-20140812.1745