Upgrade to vim 7.4, remove vim alias

+ used macvim's --override-system-vim flag to upgrade system vim to 7.4
+ Changed from zencoding-vim to emmet-vim
+ turned syntastic on
+ add stylus vim plugin

ack/ackrc.symlink

@@ -10,7 +10,8 @@
 --ignore-dir=node_modules
 
 # added file types
---type-set=css=.css,.less,.scss
+--type-set=css=.css,.less,.scss,.styl
+--type-set=styl=.styl
 --type-set=less=.less
 --type-set=html=.html,.mustache,.handlebars,.tmpl
 --type-set=json=.json