Adding social buttons squares to components page and outline buttons

@Mahdi please take a look at the btn-outline mixins and if it's clean merge it if not update me with new codes. FYI as you can see in ask facebook friends page in homepage when the user click the ask button and it's done, the wrapper tag of user info (that's not implemented in code yet) gets a class so all the inner elements get a grayscale style by the appropriate class and button gets <b>".done"</b> class.