Add Alfred linking for Brew Cask, fix appcleaner cask, add alfred cask

Add:
 * Alfred cask
 * Alfred cask linking

Fix:
 * App Cleaner cask
Replace vim-easymotion with vim-sneak

Add:
 * Vim-sneak plugin
 * Custom vim-sneak keymaps

Remove:
 * Vim-easymotion